commit 86ff1e0fe94f54f9afd32b5a61f11fb1ef5e32a6
Author: sonld <sonld@bshc.com.vn>
Date:   Tue Sep 30 09:22:49 2025 +0700

    Init project

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+    }
+  ]
+}
\ No newline at end of file
diff --git a/QuizMaster/DbHelper.cs b/QuizMaster/DbHelper.cs
new file mode 100644
index 0000000..b4edb80
--- /dev/null
+++ b/QuizMaster/DbHelper.cs
@@ -0,0 +1,77 @@
+using System.Data;
+using System.Data.SqlClient;
+using System.Reflection;
+using System.Runtime.Serialization;
+using Npgsql;
+using QuizMaster.Response;
+using System.Windows.Forms;
+
+namespace QuizMaster
+{
+    public static class DbHelper
+    {
+        public static string connectionString = "Host=192.168.10.140;Port=5432;Database=BSH_Quiz;Username=postgres;Password=0SIs7c6EYPsFNwq;Timeout=30;CommandTimeout=30;";
+        
+        public static async Task<bool> TestConnection()
+        {
+            try
+            {
+                await using var conn = new NpgsqlConnection(connectionString);
+                await conn.OpenAsync();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi kết nối database: {ex.Message}", "Database Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return false;
+            }
+        }
+
+        public static async Task<List<T>> ExecuteSelectQuery<T>(string query) where T : new()
+        {
+            DataTable table = new DataTable();
+
+            using (var conn = new NpgsqlConnection(connectionString))
+            {
+                await conn.OpenAsync();
+                using (var cmd = new NpgsqlCommand(query, conn))
+                using (var reader = await cmd.ExecuteReaderAsync())
+                {
+                    table.Load(reader);
+                }
+            }
+
+            List<T> list = new List<T>();
+
+            foreach (DataRow row in table.Rows)
+            {
+                T obj = new T();
+
+                foreach (PropertyInfo prop in typeof(T).GetProperties())
+                {
+                    if (!prop.CanWrite)
+                        continue;
+
+                    string columnName = prop.Name;
+
+                    var dataMember = prop.GetCustomAttribute<DataMemberAttribute>();
+                    if (dataMember != null && !string.IsNullOrEmpty(dataMember.Name))
+                    {
+                        columnName = dataMember.Name;
+                    }
+
+                    if (table.Columns.Contains(columnName) && row[columnName] != DBNull.Value)
+                    {
+                        Type targetType = Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType;
+                        object safeValue = Convert.ChangeType(row[columnName], targetType);
+                        prop.SetValue(obj, safeValue);
+                    }
+                }
+
+                list.Add(obj);
+            }
+
+            return list;
+        }
+    }
+}
diff --git a/QuizMaster/Form1.Designer.cs b/QuizMaster/Form1.Designer.cs
new file mode 100644
index 0000000..907ca17
--- /dev/null
+++ b/QuizMaster/Form1.Designer.cs
@@ -0,0 +1,148 @@
+namespace QuizMaster
+{
+    partial class Form1
+    {
+        /// <summary>
+        ///  Required designer variable.
+        /// </summary>
+        private System.ComponentModel.IContainer components = null;
+
+        /// <summary>
+        ///  Clean up any resources being used.
+        /// </summary>
+        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing && (components != null))
+            {
+                components.Dispose();
+            }
+            base.Dispose(disposing);
+        }
+
+        #region Windows Form Designer generated code
+
+        /// <summary>
+        ///  Required method for Designer support - do not modify
+        ///  the contents of this method with the code editor.
+        /// </summary>
+        private void InitializeComponent()
+        {
+            tabControl1 = new TabControl();
+            tabPage1 = new TabPage();
+            textBox1 = new TextBox();
+            BtnOpen = new Button();
+            label2 = new Label();
+            button1 = new Button();
+            label1 = new Label();
+            tabPage2 = new TabPage();
+            tabControl1.SuspendLayout();
+            tabPage1.SuspendLayout();
+            SuspendLayout();
+            // 
+            // tabControl1
+            // 
+            tabControl1.Controls.Add(tabPage1);
+            tabControl1.Controls.Add(tabPage2);
+            tabControl1.Location = new Point(12, 12);
+            tabControl1.Name = "tabControl1";
+            tabControl1.SelectedIndex = 0;
+            tabControl1.Size = new Size(1499, 955);
+            tabControl1.TabIndex = 0;
+            // 
+            // tabPage1
+            // 
+            tabPage1.Controls.Add(textBox1);
+            tabPage1.Controls.Add(BtnOpen);
+            tabPage1.Controls.Add(label2);
+            tabPage1.Controls.Add(button1);
+            tabPage1.Controls.Add(label1);
+            tabPage1.Location = new Point(4, 34);
+            tabPage1.Name = "tabPage1";
+            tabPage1.Padding = new Padding(3);
+            tabPage1.Size = new Size(1491, 917);
+            tabPage1.TabIndex = 0;
+            tabPage1.Text = "Tải lên bộ câu hỏi";
+            tabPage1.UseVisualStyleBackColor = true;
+            // 
+            // textBox1
+            // 
+            textBox1.Location = new Point(195, 84);
+            textBox1.Name = "textBox1";
+            textBox1.Size = new Size(273, 31);
+            textBox1.TabIndex = 7;
+            // 
+            // BtnOpen
+            // 
+            BtnOpen.Location = new Point(469, 83);
+            BtnOpen.Name = "BtnOpen";
+            BtnOpen.Size = new Size(92, 34);
+            BtnOpen.TabIndex = 6;
+            BtnOpen.Text = "open";
+            BtnOpen.UseVisualStyleBackColor = true;
+            BtnOpen.Click += btnOpen_Click;
+            // 
+            // label2
+            // 
+            label2.AutoSize = true;
+            label2.Location = new Point(28, 92);
+            label2.Name = "label2";
+            label2.Size = new Size(159, 25);
+            label2.TabIndex = 5;
+            label2.Text = "Upload bộ câu hỏi";
+            // 
+            // button1
+            // 
+            button1.Location = new Point(195, 20);
+            button1.Name = "button1";
+            button1.Size = new Size(112, 34);
+            button1.TabIndex = 4;
+            button1.Text = "Download";
+            button1.UseVisualStyleBackColor = true;
+            button1.Click += button1_Click;
+            // 
+            // label1
+            // 
+            label1.AutoSize = true;
+            label1.Location = new Point(28, 25);
+            label1.Name = "label1";
+            label1.Size = new Size(125, 25);
+            label1.TabIndex = 3;
+            label1.Text = "Tải về file mẫu";
+            // 
+            // tabPage2
+            // 
+            tabPage2.Location = new Point(4, 34);
+            tabPage2.Name = "tabPage2";
+            tabPage2.Padding = new Padding(3);
+            tabPage2.Size = new Size(1491, 917);
+            tabPage2.TabIndex = 1;
+            tabPage2.Text = "Tạo bộ câu hỏi ngẫu nhiên";
+            // 
+            // Form1
+            // 
+            AutoScaleDimensions = new SizeF(10F, 25F);
+            AutoScaleMode = AutoScaleMode.Font;
+            ClientSize = new Size(1515, 971);
+            Controls.Add(tabControl1);
+            Name = "Form1";
+            Text = "Form1";
+            Load += Form1_Load;
+            tabControl1.ResumeLayout(false);
+            tabPage1.ResumeLayout(false);
+            tabPage1.PerformLayout();
+            ResumeLayout(false);
+        }
+
+        #endregion
+
+        private TabControl tabControl1;
+        private TabPage tabPage1;
+        private TabPage tabPage2;
+        private Label label2;
+        private Button button1;
+        private Label label1;
+        private TextBox textBox1;
+        private Button BtnOpen;
+    }
+}
diff --git a/QuizMaster/Form1.cs b/QuizMaster/Form1.cs
new file mode 100644
index 0000000..b4921f6
--- /dev/null
+++ b/QuizMaster/Form1.cs
@@ -0,0 +1,393 @@
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.Data;
+using System.Diagnostics;
+using System.Drawing.Printing;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using OfficeOpenXml;
+using QuizMaster.Response;
+using QuizMaster.Service;
+using static System.Net.Mime.MediaTypeNames;
+using static System.Windows.Forms.AxHost;
+
+namespace QuizMaster
+{
+    public partial class Form1 : Form
+    {
+        public Form1()
+        {
+            InitializeComponent();
+        }
+
+        private static string defaultCombobox = "Chọn lĩnh vực";
+
+        private List<string> categorys = new List<string>();
+
+        private List<string> lstDep = new List<string>
+        {
+            "Ban CNTT",
+            "Ban XCG",
+            "Ban TCHC",
+            "Ban PTĐT"
+        };
+
+        private static string dfDep = "Chọn phòng ban";
+        private bool isUpdating = false;
+        List<Button> buttons = new List<Button>();
+        private List<ComboBox> comboBoxes = new List<ComboBox>();
+        private List<TextBox> textBoxes = new List<TextBox>();
+        public static int startY = 27; // Vị trí Y bắt đầu
+        public static int spacing = 40; // Khoảng cách giữa các ComboBox
+        public static int pointX = 19;
+
+        private void button1_Click(object sender, EventArgs e)
+        {
+        }
+
+        private async void Form1_Load(object sender, EventArgs e)
+        {
+            List<string> deps = new List<string>() { dfDep };
+            deps.AddRange(lstDep);
+            ComboBox comboMain = new ComboBox();
+            comboMain.Location = new Point(pointX, startY);
+            comboMain.Size = new Size(182, 33);
+            comboMain.Name = $"comboMain";
+            comboMain.DataSource = deps;
+            comboMain.SelectedIndexChanged += comboBoxMain_SelectedIndexChanged;
+            comboMain.DropDownStyle = ComboBoxStyle.DropDownList;
+            tabPage2.Controls.Add(comboMain);
+
+            try
+            {
+                categorys = await DataUtil.GetCategoriesAsync();
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi khi tải danh sách lĩnh vực: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                categorys = new List<string>(); // Khởi tạo list rỗng nếu có lỗi
+            }
+        }
+
+        private void ComboBox_SelectedIndexChanged(object? sender, EventArgs e)
+        {
+            if (isUpdating || sender == null) return; // Đang cập nhật hoặc sender là null, bỏ qua
+
+            isUpdating = true; // Bắt đầu cập nhật
+
+            var cbbChange = sender as ComboBox;
+            if (cbbChange == null)
+            {
+                isUpdating = false;
+                return;
+            }
+
+            // Lấy các giá trị đã được chọn, bỏ qua "-- Chọn --"
+            var daChon = comboBoxes
+                .Where(cb => cb != null && cb.SelectedIndex > 0 && cb.SelectedItem != null)
+                .Select(cb => cb.SelectedItem.ToString())
+                .Where(s => s != null)
+                .ToList();
+
+            foreach (var cb in comboBoxes.Where(cb => cb != null))
+            {
+                if (cb == cbbChange) continue; // KHÔNG cập nhật lại ComboBox đang thay đổi
+
+                var oldSelected = cb.SelectedItem?.ToString();
+
+                var danhSachMoi = categorys
+                    .Where(x => !daChon.Contains(x) || x == oldSelected)
+                    .Prepend(defaultCombobox)
+                    .ToList();
+
+                cb.DataSource = null; // Tránh sự kiện SelectedIndexChanged bị gọi lại giữa chừng
+                cb.DataSource = danhSachMoi;
+
+                int index = danhSachMoi.IndexOf(oldSelected ?? "");
+                cb.SelectedIndex = index >= 0 ? index : 0;
+            }
+
+            // Ẩn combobox thừa
+            int soLuongDaChon = daChon.Count;
+            for (int i = 0; i < comboBoxes.Count; i++)
+            {
+                if (comboBoxes[i] != null)
+                {
+                    // Chỉ hiện tối đa số lượng mục gốc
+                    comboBoxes[i].Visible = i < categorys.Count;
+                }
+            }
+            // ======= THÊM PHẦN HIỂN THỊ TEXTBOX TƯƠNG ỨNG =======
+            int indexCombo = comboBoxes.IndexOf(cbbChange);
+            string selectedText = cbbChange.SelectedItem?.ToString() ?? "";
+            //string txtBoxName = $"txtBox_{indexCombo}";
+            string txtBoxName = selectedText;
+
+            // Nếu chọn khác "-- Chọn --" thì hiển thị TextBox
+            if (selectedText != defaultCombobox)
+            {
+                var existingTextBox = tabPage2.Controls.Find(txtBoxName, true).FirstOrDefault();
+
+                if (existingTextBox == null)
+                {
+                    TextBox txt = new TextBox();
+                    txt.Name = txtBoxName;
+                    txt.Size = new Size(300, 34);
+                    txt.Location = new Point(cbbChange.Right + 10, cbbChange.Top);
+                    txt.PlaceholderText = $"Nhập số câu hỏi về {selectedText}";
+                    txt.TextAlign = HorizontalAlignment.Right;
+                    txt.KeyPress += OnlyAllowPositiveIntegers;
+                    tabPage2.Controls.Add(txt);
+                    txt.BringToFront();
+                    textBoxes.Add(txt);
+                }
+                else
+                {
+                    ((TextBox)existingTextBox).PlaceholderText = $"Nhập số câu hỏi về {selectedText}";
+                }
+            }
+            else
+            {
+                // Nếu chọn lại "-- Chọn --", thì xóa TextBox tương ứng nếu có
+                var toRemove = tabPage2.Controls.Find(txtBoxName, true).FirstOrDefault();
+                if (toRemove != null)
+                {
+                    tabPage2.Controls.Remove(toRemove);
+                    toRemove.Dispose();
+                }
+                // Xóa khỏi danh sách textBoxes
+                var txtToRemove = textBoxes.FirstOrDefault(tb => tb.Name == txtBoxName);
+                if (txtToRemove != null)
+                {
+                    textBoxes.Remove(txtToRemove);
+                }
+            }
+
+            // ==============================================
+            isUpdating = false; // Kết thúc cập nhật
+        }
+
+        private void comboBoxMain_SelectedIndexChanged(object? sender, EventArgs e)
+        {
+            ComboBox? comboBoxMain = sender as ComboBox;
+            string? selected = comboBoxMain?.SelectedItem?.ToString();
+            if (selected == null || selected == dfDep)
+            {
+                // Xóa các ComboBox đã thêm trước đó khỏi giao diện
+                foreach (var cb in comboBoxes)
+                {
+                    tabPage2.Controls.Remove(cb);
+                    cb.Dispose();
+                }
+
+                // Xóa các ComboBox đã thêm trước đó khỏi giao diện
+                foreach (var btn in buttons)
+                {
+                    tabPage2.Controls.Remove(btn);
+                    btn.Dispose();
+                }
+
+                // Xóa các ComboBox đã thêm trước đó khỏi giao diện
+                foreach (var txt in textBoxes)
+                {
+                    tabPage2.Controls.Remove(txt);
+                    txt.Dispose();
+                }
+
+                buttons.Clear();
+
+                textBoxes.Clear();
+
+                comboBoxes.Clear(); // Xóa khỏi danh sách quản lý
+                return;
+            }
+
+            List<string> initCombobox = new List<string> { defaultCombobox };
+            initCombobox.AddRange(categorys);
+            // Tạo các ComboBox mới dựa trên số lượng phần tử trong lstCategory
+
+            for (int i = 0; i < categorys.Count; i++)
+            {
+                ComboBox cb = new ComboBox();
+                cb.Location = new Point(pointX, startY + spacing + (i * spacing));
+                cb.Size = new Size(182, 33);
+                cb.Name = $"comboBox{i + 1}";
+                cb.TabIndex = i;
+                cb.FormattingEnabled = true;
+                cb.DropDownStyle = ComboBoxStyle.DropDownList;
+                cb.SelectedIndexChanged += ComboBox_SelectedIndexChanged;
+
+                // Gán danh sách ban đầu
+                cb.DataSource = new List<string>(initCombobox);
+
+                // Thêm vào tabPage2 và danh sách quản lý
+                tabPage2.Controls.Add(cb);
+                comboBoxes.Add(cb);
+            }
+
+            if (comboBoxes.Count > 0)
+            {
+                int lastCbb = comboBoxes.Last().Location.Y;
+                int heightCbb = comboBoxes.Last().Height;
+                int rightCbb = comboBoxes.Last().Right;
+                Button btGenerate = new Button();
+                btGenerate.Location = new Point(rightCbb, lastCbb + heightCbb + 20);
+                btGenerate.Size = new Size(182, 33);
+                btGenerate.Text = "Generate";
+                btGenerate.Click += btnGenClick;
+                buttons.Add(btGenerate);
+                tabPage2.Controls.Add(btGenerate);
+            }
+        }
+
+        private void OnlyAllowPositiveIntegers(object? sender, KeyPressEventArgs e)
+        {
+            // Cho phép phím số và phím điều hướng (Backspace)
+            if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar))
+            {
+                e.Handled = true; // Chặn ký tự không hợp lệ
+            }
+        }
+
+        private async void btnGenClick(object? sender, EventArgs e)
+        {
+            // validate không được bỏ trống ô textbox
+            Dictionary<string, string> lstCategory = new Dictionary<string, string>();
+            foreach (var txt in textBoxes)
+            {
+                if (string.IsNullOrWhiteSpace(txt.Text))
+                {
+                    txt.Focus();
+                    await FlashControl(txt);
+                    return;
+                }
+                lstCategory.Add(txt.Name, txt.Text);
+            }
+
+            // validate số câu hỏi cần gen phải nhỏ hơn số câu có trong DB
+            var totalCategory = await DataUtil.GetTotalCategoriesAsync(lstCategory.Keys.ToList());
+            var aaa = await DataUtil.getAllQA("SQL");
+            // Get all câu hỏi và câu trả lời
+            var grouped = aaa
+                .GroupBy(q => new { q.QuestionId, q.Question })
+                .Select(group => new
+                {
+                    QuestionId = group.Key.QuestionId,
+                    Question = group.Key.Question,
+                    Options = group.Select(o => new
+                    {
+                        Text = o.Option,
+                        IsCorrect = o.IsCorrect == 1
+                    }).ToList()
+                })
+                .ToList();
+
+            // Thực hiện generate ra bộ đề test
+            Console.WriteLine("a");
+        }
+
+        private HashSet<Control> flashingControls = new HashSet<Control>();
+        private async Task FlashControl(Control control)
+        {
+            if (flashingControls.Contains(control))
+                return; // Đã nhấp nháy => bỏ qua
+
+            flashingControls.Add(control);
+            var originalColor = control.BackColor;
+
+            for (int i = 0; i < 3; i++)
+            {
+                control.BackColor = Color.LightPink;
+                await Task.Delay(200);
+                control.BackColor = originalColor;
+                await Task.Delay(200);
+            }
+
+            flashingControls.Remove(control);
+        }
+
+        private async void btnOpen_Click(object sender, EventArgs e)
+        {
+            using (OpenFileDialog openFileDialog = new OpenFileDialog())
+            {
+                openFileDialog.InitialDirectory = "c:\\"; // hoặc thư mục mặc định bạn muốn
+                openFileDialog.Filter = "Excel Files (*.xlsx)|*.xlsx";
+                openFileDialog.FilterIndex = 1;
+                openFileDialog.RestoreDirectory = true;
+                openFileDialog.CheckFileExists = true;
+                openFileDialog.CheckPathExists = true;
+
+                if (openFileDialog.ShowDialog() == DialogResult.OK)
+                {
+                    // Lấy đường dẫn file đã chọn
+                    string filePath = openFileDialog.FileName;
+
+                    List<string> errors = ExcelValidator.ValidateExcel(filePath);
+
+                    // Đọc toàn bộ dữ liệu
+                    List<Quiz> result = ExecuteExcelService.ReadExcelFile(filePath);
+
+                    if (errors != null && errors.Count > 0)
+                    {
+                        // Hiển thị các lỗi nối thành chuỗi, mỗi lỗi trên một dòng
+                        string errorMessage = string.Join(Environment.NewLine, errors);
+
+                        DialogResult dialogResult = MessageBox.Show(
+                        errorMessage + "\n\nBạn có muốn tiếp tục và bỏ qua các dòng bị lỗi không?",
+                        "Lỗi validate file Excel",
+                        MessageBoxButtons.YesNo,
+                        MessageBoxIcon.Warning
+                        );
+
+                        if (dialogResult == DialogResult.No)
+                        {
+                            return; // Dừng nếu người dùng chọn No
+                        }
+
+                        // Tách ra số dòng bị lỗi từ danh sách lỗi, ví dụ "Row 3:"
+                        HashSet<int> errorRows = new HashSet<int>();
+                        foreach (string error in errors)
+                        {
+                            Match match = Regex.Match(error, @"Dòng\s+(\d+)", RegexOptions.IgnoreCase);
+                            if (match.Success && int.TryParse(match.Groups[1].Value, out int rowNumber))
+                            {
+                                errorRows.Add(rowNumber);
+                            }
+                        }
+
+                        // Loại bỏ dòng bị lỗi (giả sử index = rowNumber - 2 do header ở dòng 1)
+                        result = result
+                            .Where((q, index) => !errorRows.Contains(index + 2)) // +2 nếu dòng header là dòng 1
+                            .ToList();
+                    }
+
+                    // Get new list Quiz after check exits in database
+                    List<Quiz> insertQuiz = new List<Quiz>();
+
+                    foreach (Quiz quiz in result)
+                    {
+                        string compositeKey = $"{quiz.CauHoi}__{quiz.A}__{quiz.B}__{quiz.C}__{quiz.D}";
+                        var existRecord = await DataUtil.QuestionAndAnswersExistAsync(quiz.CauHoi, compositeKey, DbHelper.connectionString);
+                        if (!existRecord)
+                        {
+                            insertQuiz.Add(quiz);
+                        }
+                    }
+
+                    if (insertQuiz.Count > 0)
+                    {
+                        bool success = await DataUtil.InsertQuestionAndAnswersAsync(insertQuiz);
+                        if (success)
+                        {
+                            MessageBox.Show($"Đã thêm thành công {insertQuiz.Count} câu hỏi và đáp án vào database.", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                        }
+                    }
+                    else
+                    {
+                        MessageBox.Show("Không có câu hỏi mới nào cần thêm vào database.", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/QuizMaster/Form1.resx b/QuizMaster/Form1.resx
new file mode 100644
index 0000000..8b2ff64
--- /dev/null
+++ b/QuizMaster/Form1.resx
@@ -0,0 +1,120 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!--
+    Microsoft ResX Schema
+
+    Version 2.0
+
+    The primary goals of this format is to allow a simple XML format
+    that is mostly human readable. The generation and parsing of the
+    various data types are done through the TypeConverter classes
+    associated with the data types.
+
+    Example:
+
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+
+    There are any number of "resheader" rows that contain simple
+    name/value pairs.
+
+    Each data row contains a name, and value. The row also contains a
+    type or mimetype. Type corresponds to a .NET class that support
+    text/value conversion through the TypeConverter architecture.
+    Classes that don't support this are serialized and stored with the
+    mimetype set.
+
+    The mimetype is used for serialized objects, and tells the
+    ResXResourceReader how to depersist the object. This is currently not
+    extensible. For a given mimetype the value must be set accordingly:
+
+    Note - application/x-microsoft.net.object.binary.base64 is the format
+    that the ResXResourceWriter will generate, however the reader can
+    read any of the formats listed below.
+
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+</root>
\ No newline at end of file
diff --git a/QuizMaster/Program.cs b/QuizMaster/Program.cs
new file mode 100644
index 0000000..b00622d
--- /dev/null
+++ b/QuizMaster/Program.cs
@@ -0,0 +1,20 @@
+using OfficeOpenXml;
+
+namespace QuizMaster
+{
+    internal static class Program
+    {
+        /// <summary>
+        ///  The main entry point for the application.
+        /// </summary>
+        [STAThread]
+        static void Main()
+        {
+            ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
+            // To customize application configuration such as set high DPI settings or default font,
+            // see https://aka.ms/applicationconfiguration.
+            ApplicationConfiguration.Initialize();
+            Application.Run(new Form1());
+        }
+    }
+}
\ No newline at end of file
diff --git a/QuizMaster/Properties/Resources.Designer.cs b/QuizMaster/Properties/Resources.Designer.cs
new file mode 100644
index 0000000..62e87a9
--- /dev/null
+++ b/QuizMaster/Properties/Resources.Designer.cs
@@ -0,0 +1,73 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace QuizMaster.Properties {
+    using System;
+    
+    
+    /// <summary>
+    ///   A strongly-typed resource class, for looking up localized strings, etc.
+    /// </summary>
+    // This class was auto-generated by the StronglyTypedResourceBuilder
+    // class via a tool like ResGen or Visual Studio.
+    // To add or remove a member, edit your .ResX file then rerun ResGen
+    // with the /str option, or rebuild your VS project.
+    [global::System.CodeDom.Compiler.GeneratedCodeAttribute("System.Resources.Tools.StronglyTypedResourceBuilder", "17.0.0.0")]
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    [global::System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
+    internal class Resources {
+        
+        private static global::System.Resources.ResourceManager resourceMan;
+        
+        private static global::System.Globalization.CultureInfo resourceCulture;
+        
+        [global::System.Diagnostics.CodeAnalysis.SuppressMessageAttribute("Microsoft.Performance", "CA1811:AvoidUncalledPrivateCode")]
+        internal Resources() {
+        }
+        
+        /// <summary>
+        ///   Returns the cached ResourceManager instance used by this class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Resources.ResourceManager ResourceManager {
+            get {
+                if (object.ReferenceEquals(resourceMan, null)) {
+                    global::System.Resources.ResourceManager temp = new global::System.Resources.ResourceManager("QuizMaster.Properties.Resources", typeof(Resources).Assembly);
+                    resourceMan = temp;
+                }
+                return resourceMan;
+            }
+        }
+        
+        /// <summary>
+        ///   Overrides the current thread's CurrentUICulture property for all
+        ///   resource lookups using this strongly typed resource class.
+        /// </summary>
+        [global::System.ComponentModel.EditorBrowsableAttribute(global::System.ComponentModel.EditorBrowsableState.Advanced)]
+        internal static global::System.Globalization.CultureInfo Culture {
+            get {
+                return resourceCulture;
+            }
+            set {
+                resourceCulture = value;
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized resource of type System.Drawing.Bitmap.
+        /// </summary>
+        internal static System.Drawing.Bitmap folder {
+            get {
+                object obj = ResourceManager.GetObject("folder", resourceCulture);
+                return ((System.Drawing.Bitmap)(obj));
+            }
+        }
+    }
+}
diff --git a/QuizMaster/Properties/Resources.resx b/QuizMaster/Properties/Resources.resx
new file mode 100644
index 0000000..7099243
--- /dev/null
+++ b/QuizMaster/Properties/Resources.resx
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="utf-8"?>
+<root>
+  <!-- 
+    Microsoft ResX Schema 
+    
+    Version 2.0
+    
+    The primary goals of this format is to allow a simple XML format 
+    that is mostly human readable. The generation and parsing of the 
+    various data types are done through the TypeConverter classes 
+    associated with the data types.
+    
+    Example:
+    
+    ... ado.net/XML headers & schema ...
+    <resheader name="resmimetype">text/microsoft-resx</resheader>
+    <resheader name="version">2.0</resheader>
+    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
+    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
+    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
+    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
+    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
+        <value>[base64 mime encoded serialized .NET Framework object]</value>
+    </data>
+    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
+        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
+        <comment>This is a comment</comment>
+    </data>
+                
+    There are any number of "resheader" rows that contain simple 
+    name/value pairs.
+    
+    Each data row contains a name, and value. The row also contains a 
+    type or mimetype. Type corresponds to a .NET class that support 
+    text/value conversion through the TypeConverter architecture. 
+    Classes that don't support this are serialized and stored with the 
+    mimetype set.
+    
+    The mimetype is used for serialized objects, and tells the 
+    ResXResourceReader how to depersist the object. This is currently not 
+    extensible. For a given mimetype the value must be set accordingly:
+    
+    Note - application/x-microsoft.net.object.binary.base64 is the format 
+    that the ResXResourceWriter will generate, however the reader can 
+    read any of the formats listed below.
+    
+    mimetype: application/x-microsoft.net.object.binary.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
+            : and then encoded with base64 encoding.
+    
+    mimetype: application/x-microsoft.net.object.soap.base64
+    value   : The object must be serialized with 
+            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
+            : and then encoded with base64 encoding.
+
+    mimetype: application/x-microsoft.net.object.bytearray.base64
+    value   : The object must be serialized into a byte array 
+            : using a System.ComponentModel.TypeConverter
+            : and then encoded with base64 encoding.
+    -->
+  <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
+    <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
+    <xsd:element name="root" msdata:IsDataSet="true">
+      <xsd:complexType>
+        <xsd:choice maxOccurs="unbounded">
+          <xsd:element name="metadata">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" />
+              </xsd:sequence>
+              <xsd:attribute name="name" use="required" type="xsd:string" />
+              <xsd:attribute name="type" type="xsd:string" />
+              <xsd:attribute name="mimetype" type="xsd:string" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="assembly">
+            <xsd:complexType>
+              <xsd:attribute name="alias" type="xsd:string" />
+              <xsd:attribute name="name" type="xsd:string" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="data">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+                <xsd:element name="comment" type="xsd:string" minOccurs="0" msdata:Ordinal="2" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" msdata:Ordinal="1" />
+              <xsd:attribute name="type" type="xsd:string" msdata:Ordinal="3" />
+              <xsd:attribute name="mimetype" type="xsd:string" msdata:Ordinal="4" />
+              <xsd:attribute ref="xml:space" />
+            </xsd:complexType>
+          </xsd:element>
+          <xsd:element name="resheader">
+            <xsd:complexType>
+              <xsd:sequence>
+                <xsd:element name="value" type="xsd:string" minOccurs="0" msdata:Ordinal="1" />
+              </xsd:sequence>
+              <xsd:attribute name="name" type="xsd:string" use="required" />
+            </xsd:complexType>
+          </xsd:element>
+        </xsd:choice>
+      </xsd:complexType>
+    </xsd:element>
+  </xsd:schema>
+  <resheader name="resmimetype">
+    <value>text/microsoft-resx</value>
+  </resheader>
+  <resheader name="version">
+    <value>2.0</value>
+  </resheader>
+  <resheader name="reader">
+    <value>System.Resources.ResXResourceReader, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <resheader name="writer">
+    <value>System.Resources.ResXResourceWriter, System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089</value>
+  </resheader>
+  <assembly alias="System.Windows.Forms" name="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
+  <data name="folder" type="System.Resources.ResXFileRef, System.Windows.Forms">
+    <value>..\Resources\folder.png;System.Drawing.Bitmap, System.Drawing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a</value>
+  </data>
+</root>
\ No newline at end of file
diff --git a/QuizMaster/QuizMaster.csproj b/QuizMaster/QuizMaster.csproj
new file mode 100644
index 0000000..e294017
--- /dev/null
+++ b/QuizMaster/QuizMaster.csproj
@@ -0,0 +1,32 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net7.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Update="Properties\Resources.Designer.cs">
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+      <DependentUpon>Resources.resx</DependentUpon>
+    </Compile>
+  </ItemGroup>
+
+  <ItemGroup>
+    <EmbeddedResource Update="Properties\Resources.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+    </EmbeddedResource>
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="EPPlus" Version="7.0.8" />
+    <PackageReference Include="Npgsql" Version="9.0.3" />
+    <PackageReference Include="System.Data.SqlClient" Version="4.9.0" />
+  </ItemGroup>
+
+</Project>
\ No newline at end of file
diff --git a/QuizMaster/QuizMaster.csproj.user b/QuizMaster/QuizMaster.csproj.user
new file mode 100644
index 0000000..7814ea2
--- /dev/null
+++ b/QuizMaster/QuizMaster.csproj.user
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <ItemGroup>
+        <Compile Update="Form1.cs">
+            <SubType>Form</SubType>
+        </Compile>
+    </ItemGroup>
+</Project>
diff --git a/QuizMaster/QuizMaster.sln b/QuizMaster/QuizMaster.sln
new file mode 100644
index 0000000..d028d1c
--- /dev/null
+++ b/QuizMaster/QuizMaster.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.13.35931.197 d17.13
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "QuizMaster", "QuizMaster.csproj", "{582DBFA6-720D-44B4-B48C-909F4DD98783}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{582DBFA6-720D-44B4-B48C-909F4DD98783}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{582DBFA6-720D-44B4-B48C-909F4DD98783}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{582DBFA6-720D-44B4-B48C-909F4DD98783}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{582DBFA6-720D-44B4-B48C-909F4DD98783}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {B63E2517-7189-410C-85C3-D4FDE0FF78E3}
+	EndGlobalSection
+EndGlobal
diff --git a/QuizMaster/Resources/folder.png b/QuizMaster/Resources/folder.png
new file mode 100644
index 0000000..64f4d27
Binary files /dev/null and b/QuizMaster/Resources/folder.png differ
diff --git a/QuizMaster/Response/CategoryInfo.cs b/QuizMaster/Response/CategoryInfo.cs
new file mode 100644
index 0000000..e933a43
--- /dev/null
+++ b/QuizMaster/Response/CategoryInfo.cs
@@ -0,0 +1,8 @@
+namespace QuizMaster.Response
+{
+    internal class CategoryInfo
+    {
+        public string Category { get; set; } = "";
+        public int Total { get; set; }
+    }
+}
diff --git a/QuizMaster/Response/Question.cs b/QuizMaster/Response/Question.cs
new file mode 100644
index 0000000..4ed9f55
--- /dev/null
+++ b/QuizMaster/Response/Question.cs
@@ -0,0 +1,29 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace QuizMaster.Response
+{
+    [DataContract]
+    public class Question
+    {
+        [DataMember(Name = "id")]
+        public int Id { get; set; }
+
+        [DataMember(Name = "content")]
+        public string? Content { get; set; }
+
+        [DataMember(Name = "category")]
+        public string? Category { get; set; }
+
+        [DataMember(Name = "answercombo")]
+        public string? AnswerCombo { get; set; }
+
+        [DataMember(Name = "createdat")]
+        public DateTime? CreatedAt { get; set; }
+    }
+
+}
diff --git a/QuizMaster/Response/QuestionOption.cs b/QuizMaster/Response/QuestionOption.cs
new file mode 100644
index 0000000..942bfb7
--- /dev/null
+++ b/QuizMaster/Response/QuestionOption.cs
@@ -0,0 +1,10 @@
+namespace QuizMaster.Response
+{
+    internal class QuestionOption
+    {
+        public int QuestionId { get; set; }
+        public string Question { get; set; }
+        public string Option { get; set; }
+        public int IsCorrect { get; set; } // 1 = đúng, 0 = sai
+    }
+}
diff --git a/QuizMaster/Response/Quiz.cs b/QuizMaster/Response/Quiz.cs
new file mode 100644
index 0000000..e33015d
--- /dev/null
+++ b/QuizMaster/Response/Quiz.cs
@@ -0,0 +1,15 @@
+using System.Runtime.Serialization;
+
+namespace QuizMaster.Response
+{
+    public class Quiz
+    {
+        public required string LinhVuc { get; set; }
+        public required string CauHoi { get; set; }
+        public string? A { get; set; }
+        public string? B { get; set; }
+        public string? C { get; set; }
+        public string? D { get; set; }
+        public required string DapAn { get; set; }
+    }
+}
diff --git a/QuizMaster/Service/DataUtil.cs b/QuizMaster/Service/DataUtil.cs
new file mode 100644
index 0000000..86bba3c
--- /dev/null
+++ b/QuizMaster/Service/DataUtil.cs
@@ -0,0 +1,249 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection.Metadata;
+using System.Text;
+using System.Threading.Tasks;
+using Npgsql;
+using QuizMaster.Response;
+
+namespace QuizMaster.Service
+{
+    internal class DataUtil
+    {
+        public static async Task<bool> QuestionAndAnswersExistAsync(
+        string questionContent,
+        string answerContents,
+        string connectionString)
+        {
+            await using var conn = new NpgsqlConnection(connectionString);
+            await conn.OpenAsync();
+
+            // 1. Kiểm tra xem câu hỏi đã tồn tại chưa
+            var questionIdCmd = new NpgsqlCommand(@"
+            SELECT Id FROM Question WHERE Content = @content AND AnswerCombo = @answerCombo;
+        ", conn);
+
+            questionIdCmd.Parameters.AddWithValue("content", questionContent);
+            questionIdCmd.Parameters.AddWithValue("answerCombo", answerContents);
+            var questionIdObj = await questionIdCmd.ExecuteScalarAsync();
+
+            if (questionIdObj == null)
+                return false;
+
+            return true;
+        }
+
+        public static async Task<List<string>> GetCategoriesAsync()
+        {
+            List<string> categories = new List<string>();
+            using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            _ = conn.OpenAsync();
+
+            try
+            {
+                var cmd = new NpgsqlCommand(@"
+                    SELECT DISTINCT Category 
+                    FROM Question 
+                    WHERE Category IS NOT NULL 
+                    ORDER BY Category;
+                ", conn);
+
+                await using var reader = await cmd.ExecuteReaderAsync();
+                while (await reader.ReadAsync())
+                {
+                    var category = reader.GetString(0);
+                    if (!string.IsNullOrEmpty(category))
+                    {
+                        categories.Add(category);
+                    }
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi khi lấy danh sách category: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                throw;
+            }
+
+            return categories;
+        }
+
+        public static async Task<List<CategoryInfo>> GetTotalCategoriesAsync(List<string> lstCategory)
+        {
+            var categories = new List<CategoryInfo>();
+            if (lstCategory == null || lstCategory.Count == 0)
+            {
+                return categories;
+            }
+            string whereCate = string.Join(",", lstCategory.Select(c => $"'{c.Replace("'", "''")}'"));
+            await using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            await conn.OpenAsync();
+
+            try
+            {
+                var cmd = new NpgsqlCommand(@"
+                SELECT category, COUNT(*) AS Total
+                FROM question
+                WHERE category IN (" + whereCate + ") GROUP BY category ;", conn);
+
+                await using var reader = await cmd.ExecuteReaderAsync();
+                while (await reader.ReadAsync())
+                {
+                    categories.Add(new CategoryInfo
+                    {
+                        Category = reader.GetString(0),
+                        Total = reader.GetInt32(1)
+                    });
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi khi lấy danh sách category: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                throw;
+            }
+
+            return categories;
+        }
+
+        public static async Task<List<QuestionOption>> getAllQA(string Category)
+        {
+            var questionOption = new List<QuestionOption>();
+
+            await using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            await conn.OpenAsync();
+
+            try
+            {
+                var cmd = new NpgsqlCommand(@"
+                select q.id ,q.content, a.content,a.iscorrect from answer a inner join question q on a.questionid =q.id where q.category = '" + Category + "';", conn);
+
+                await using var reader = await cmd.ExecuteReaderAsync();
+                while (await reader.ReadAsync())
+                {
+                    questionOption.Add(new QuestionOption
+                    {
+                        QuestionId = reader.IsDBNull(0) ? 0 : reader.GetInt32(0),
+                        Question = reader.IsDBNull(1) ? string.Empty : reader.GetString(1),
+                        Option = reader.IsDBNull(2) ? string.Empty : reader.GetString(2),
+                        IsCorrect = reader.IsDBNull(3) ? 0 : reader.GetInt32(3)
+                    });
+                }
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Lỗi khi lấy danh sách category: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                throw;
+            }
+
+            return questionOption;
+        }
+
+        public static async Task<bool> InsertQuestionAndAnswersAsync(List<Quiz> questions)
+        {
+            await using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            await conn.OpenAsync();
+            await using var transaction = await conn.BeginTransactionAsync();
+
+            try
+            {
+                // Dictionary để lưu mapping giữa compositeKey và questionId
+                var questionIdMap = new Dictionary<string, int>();
+
+                // Insert questions
+                foreach (var q in questions)
+                {
+                    string compositeKey = $"{q.CauHoi}__{q.A}__{q.B}__{q.C}__{q.D}";
+
+                    // Insert question
+                    var cmdQuestion = new NpgsqlCommand(@"
+                        INSERT INTO Question (Content, Category, AnswerCombo)
+                        VALUES (@content, @category, @answerCombo)
+                        RETURNING Id;
+                    ", conn, transaction);
+
+                    cmdQuestion.Parameters.AddWithValue("content", q.CauHoi);
+                    cmdQuestion.Parameters.AddWithValue("category", q.LinhVuc);
+                    cmdQuestion.Parameters.AddWithValue("answerCombo", compositeKey);
+
+                    var questionId = (int?)await cmdQuestion.ExecuteScalarAsync();
+
+                    if (!questionId.HasValue)
+                    {
+                        throw new Exception($"Không thể insert câu hỏi: {q.CauHoi}");
+                    }
+
+                    questionIdMap[compositeKey] = questionId.Value;
+
+                    // Insert answers
+                    var answerOptions = new Dictionary<string, string?>
+                    {
+                        { "A", q.A },
+                        { "B", q.B },
+                        { "C", q.C },
+                        { "D", q.D }
+                    };
+
+                    foreach (var opt in answerOptions)
+                    {
+                        var cmdAnswer = new NpgsqlCommand(@"
+                            INSERT INTO Answer (QuestionId, Content, IsCorrect)
+                            VALUES (@questionId, @content, @isCorrect);
+                        ", conn, transaction);
+
+                        cmdAnswer.Parameters.AddWithValue("questionId", questionId.Value);
+                        cmdAnswer.Parameters.AddWithValue("content", opt.Value ?? (object)DBNull.Value);
+                        cmdAnswer.Parameters.AddWithValue("isCorrect", opt.Key == q.DapAn ? 1 : 0);
+
+                        await cmdAnswer.ExecuteNonQueryAsync();
+                    }
+                }
+
+                await transaction.CommitAsync();
+                return true;
+            }
+            catch (Exception ex)
+            {
+                await transaction.RollbackAsync();
+                MessageBox.Show($"Lỗi khi thêm câu hỏi và đáp án: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return false;
+            }
+        }
+
+        public static async Task<int> GetTotalQuestionCount()
+        {
+            string query = "SELECT COUNT(*) FROM Question";
+
+            await using var conn = new NpgsqlConnection(DbHelper.connectionString);
+            await conn.OpenAsync();
+            await using var cmd = new NpgsqlCommand(query, conn);
+
+            var result = await cmd.ExecuteScalarAsync();
+            if (result == null || result == DBNull.Value)
+            {
+                return 0;
+            }
+
+            return Convert.ToInt32(result);
+        }
+
+        public static async Task<List<Question>> GetRandomQuestions(int requestedCount)
+        {
+            int totalCount = await GetTotalQuestionCount();
+
+            if (requestedCount <= 0)
+            {
+                MessageBox.Show("Vui lòng nhập số lượng lớn hơn 0.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return new List<Question>();
+            }
+
+            if (requestedCount > totalCount)
+            {
+                MessageBox.Show($"Chỉ có {totalCount} câu hỏi trong cơ sở dữ liệu.", "Thông báo", MessageBoxButtons.OK, MessageBoxIcon.Warning);
+                return new List<Question>();
+            }
+
+            string query = $"SELECT * FROM Question ORDER BY RANDOM() LIMIT {requestedCount}";
+            return await DbHelper.ExecuteSelectQuery<Question>(query);
+        }
+    }
+}
diff --git a/QuizMaster/Service/ExcelValidator.cs b/QuizMaster/Service/ExcelValidator.cs
new file mode 100644
index 0000000..a710def
--- /dev/null
+++ b/QuizMaster/Service/ExcelValidator.cs
@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using OfficeOpenXml;
+
+namespace QuizMaster.Service
+{
+    public static class ExcelValidator
+    {
+        private static readonly List<string> ExpectedHeaders = new()
+    {
+        "Lĩnh vực", "Câu hỏi", "A", "B", "C", "D", "Đáp án"
+    };
+
+        public static List<string> ValidateExcel(string filePath)
+        {
+            var errors = new List<string>();
+            var questionOptionDict = new Dictionary<string, int>(StringComparer.OrdinalIgnoreCase);
+
+            ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
+
+            using var package = new ExcelPackage(new FileInfo(filePath));
+            var worksheet = package.Workbook.Worksheets[0]; // Sheet đầu tiên
+
+            // 1. Kiểm tra header
+            for (int i = 0; i < ExpectedHeaders.Count; i++)
+            {
+                string cellValue = worksheet.Cells[1, i + 1].Text.Trim();
+                if (cellValue != ExpectedHeaders[i])
+                {
+                    errors.Add($"Cột {i + 1} phải là '{ExpectedHeaders[i]}', nhưng là '{cellValue}'");
+                }
+            }
+
+            // 2. Kiểm tra từng dòng dữ liệu
+            int row = 2;
+            while (true)
+            {
+                var firstCell = worksheet.Cells[row, 1];
+                if (string.IsNullOrWhiteSpace(firstCell.Text)) break; // Dòng trống → kết thúc
+
+                string field = worksheet.Cells[row, 1].Text.Trim();
+                string question = worksheet.Cells[row, 2].Text.Trim();
+                string ansA = worksheet.Cells[row, 3].Text.Trim();
+                string ansB = worksheet.Cells[row, 4].Text.Trim();
+                string ansC = worksheet.Cells[row, 5].Text.Trim();
+                string ansD = worksheet.Cells[row, 6].Text.Trim();
+                string answer = worksheet.Cells[row, 7].Text.Trim().ToUpper();
+
+                if (string.IsNullOrWhiteSpace(field))
+                    errors.Add($"Dòng {row}: 'Lĩnh vực' không được trống");
+
+                if (string.IsNullOrWhiteSpace(question))
+                {
+                    errors.Add($"Dòng {row}: 'Câu hỏi' không được trống");
+                }
+                else
+                {
+                    string compositeKey = $"{question}__{ansA}__{ansB}__{ansC}__{ansD}";
+                    if (questionOptionDict.TryGetValue(compositeKey, out int existingRow))
+                    {
+                        errors.Add($"Dòng {row}: Câu hỏi và các đáp án A–D trùng với dòng {existingRow}");
+                    }
+                    else
+                    {
+                        questionOptionDict[compositeKey] = row;
+                    }
+                }
+
+                // Phải có ít nhất 1 trong các phương án A-D
+                if (string.IsNullOrWhiteSpace(ansA) &&
+                    string.IsNullOrWhiteSpace(ansB) &&
+                    string.IsNullOrWhiteSpace(ansC) &&
+                    string.IsNullOrWhiteSpace(ansD))
+                {
+                    errors.Add($"Dòng {row}: Cần ít nhất 1 phương án A, B, C hoặc D");
+                }
+
+                if (string.IsNullOrWhiteSpace(answer))
+                {
+                    errors.Add($"Dòng {row}: 'Đáp án' không được trống");
+                }
+                else if (!new[] { "A", "B", "C", "D" }.Contains(answer))
+                {
+                    errors.Add($"Dòng {row}: 'Đáp án' phải là A, B, C hoặc D (hiện tại là '{answer}')");
+                }
+
+                row++;
+            }
+
+            return errors;
+        }
+    }
+}
diff --git a/QuizMaster/Service/ExecuteExcelService.cs b/QuizMaster/Service/ExecuteExcelService.cs
new file mode 100644
index 0000000..1a155f9
--- /dev/null
+++ b/QuizMaster/Service/ExecuteExcelService.cs
@@ -0,0 +1,42 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using OfficeOpenXml;
+using QuizMaster.Response;
+
+namespace QuizMaster.Service
+{
+    public static class ExecuteExcelService
+    {
+        public static List<Quiz> ReadExcelFile(string filePath)
+        {
+            var result = new List<Quiz>();
+
+            using (var package = new ExcelPackage(new FileInfo(filePath)))
+            {
+                var worksheet = package.Workbook.Worksheets[0]; // Sheet đầu tiên
+                int rowCount = worksheet.Dimension.Rows;
+
+                for (int row = 2; row <= rowCount; row++) // Bắt đầu từ dòng 2, bỏ dòng tiêu đề
+                {
+                    var ch = new Quiz
+                    {
+                        LinhVuc = worksheet.Cells[row, 1].Text,
+                        CauHoi = worksheet.Cells[row, 2].Text,
+                        A = worksheet.Cells[row, 3].Text,
+                        B = worksheet.Cells[row, 4].Text,
+                        C = worksheet.Cells[row, 5].Text,
+                        D = worksheet.Cells[row, 6].Text,
+                        DapAn = worksheet.Cells[row, 7].Text
+                    };
+
+                    result.Add(ch);
+                }
+            }
+
+            return result;
+        }
+    }
+}
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+      "path": "runtime.native.system.data.sqlclient.sni/4.4.0",
+      "hashPath": "runtime.native.system.data.sqlclient.sni.4.4.0.nupkg.sha512"
+    },
+    "runtime.win-arm64.runtime.native.System.Data.SqlClient.sni/4.4.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-LbrynESTp3bm5O/+jGL8v0Qg5SJlTV08lpIpFesXjF6uGNMWqFnUQbYBJwZTeua6E/Y7FIM1C54Ey1btLWupdg==",
+      "path": "runtime.win-arm64.runtime.native.system.data.sqlclient.sni/4.4.0",
+      "hashPath": "runtime.win-arm64.runtime.native.system.data.sqlclient.sni.4.4.0.nupkg.sha512"
+    },
+    "runtime.win-x64.runtime.native.System.Data.SqlClient.sni/4.4.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-38ugOfkYJqJoX9g6EYRlZB5U2ZJH51UP8ptxZgdpS07FgOEToV+lS11ouNK2PM12Pr6X/PpT5jK82G3DwH/SxQ==",
+      "path": "runtime.win-x64.runtime.native.system.data.sqlclient.sni/4.4.0",
+      "hashPath": "runtime.win-x64.runtime.native.system.data.sqlclient.sni.4.4.0.nupkg.sha512"
+    },
+    "runtime.win-x86.runtime.native.System.Data.SqlClient.sni/4.4.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-YhEdSQUsTx+C8m8Bw7ar5/VesXvCFMItyZF7G1AUY+OM0VPZUOeAVpJ4Wl6fydBGUYZxojTDR3I6Bj/+BPkJNA==",
+      "path": "runtime.win-x86.runtime.native.system.data.sqlclient.sni/4.4.0",
+      "hashPath": "runtime.win-x86.runtime.native.system.data.sqlclient.sni.4.4.0.nupkg.sha512"
+    },
+    "System.ComponentModel.Annotations/5.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-dMkqfy2el8A8/I76n2Hi1oBFEbG1SfxD2l5nhwXV3XjlnOmwxJlQbYpJH4W51odnU9sARCSAgv7S3CyAFMkpYg==",
+      "path": "system.componentmodel.annotations/5.0.0",
+      "hashPath": "system.componentmodel.annotations.5.0.0.nupkg.sha512"
+    },
+    "System.Data.SqlClient/4.9.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-j4KJO+vC62NyUtNHz854njEqXbT8OmAa5jb1nrGfYWBOcggyYUQE0w/snXeaCjdvkSKWuUD+hfvlbN8pTrJTXg==",
+      "path": "system.data.sqlclient/4.9.0",
+      "hashPath": "system.data.sqlclient.4.9.0.nupkg.sha512"
+    },
+    "System.Diagnostics.DiagnosticSource/8.0.1": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-vaoWjvkG1aenR2XdjaVivlCV9fADfgyhW5bZtXT23qaEea0lWiUljdQuze4E31vKM7ZWJaSUsbYIKE3rnzfZUg==",
+      "path": "system.diagnostics.diagnosticsource/8.0.1",
+      "hashPath": "system.diagnostics.diagnosticsource.8.0.1.nupkg.sha512"
+    },
+    "System.Drawing.Common/7.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-KIX+oBU38pxkKPxvLcLfIkOV5Ien8ReN78wro7OF5/erwcmortzeFx+iBswlh2Vz6gVne0khocQudGwaO1Ey6A==",
+      "path": "system.drawing.common/7.0.0",
+      "hashPath": "system.drawing.common.7.0.0.nupkg.sha512"
+    },
+    "System.Formats.Asn1/7.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-+nfpV0afLmvJW8+pLlHxRjz3oZJw4fkyU9MMEaMhCsHi/SN9bGF9q79ROubDiwTiCHezmK0uCWkPP7tGFP/4yg==",
+      "path": "system.formats.asn1/7.0.0",
+      "hashPath": "system.formats.asn1.7.0.0.nupkg.sha512"
+    },
+    "System.Runtime.CompilerServices.Unsafe/6.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-/iUeP3tq1S0XdNNoMz5C9twLSrM/TH+qElHkXWaPvuNOt+99G75NrV0OS2EqHx5wMN7popYjpc8oTjC1y16DLg==",
+      "path": "system.runtime.compilerservices.unsafe/6.0.0",
+      "hashPath": "system.runtime.compilerservices.unsafe.6.0.0.nupkg.sha512"
+    },
+    "System.Security.Cryptography.Pkcs/7.0.3": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-yhwEHH5Gzl/VoADrXtt5XC95OFoSjNSWLHNutE7GwdOgefZVRvEXRSooSpL8HHm3qmdd9epqzsWg28UJemt22w==",
+      "path": "system.security.cryptography.pkcs/7.0.3",
+      "hashPath": "system.security.cryptography.pkcs.7.0.3.nupkg.sha512"
+    },
+    "System.Text.Encoding.CodePages/7.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-LSyCblMpvOe0N3E+8e0skHcrIhgV2huaNcjUUEa8hRtgEAm36aGkRoC8Jxlb6Ra6GSfF29ftduPNywin8XolzQ==",
+      "path": "system.text.encoding.codepages/7.0.0",
+      "hashPath": "system.text.encoding.codepages.7.0.0.nupkg.sha512"
+    },
+    "System.Text.Encodings.Web/8.0.0": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-yev/k9GHAEGx2Rg3/tU6MQh4HGBXJs70y7j1LaM1i/ER9po+6nnQ6RRqTJn1E7Xu0fbIFK80Nh5EoODxrbxwBQ==",
+      "path": "system.text.encodings.web/8.0.0",
+      "hashPath": "system.text.encodings.web.8.0.0.nupkg.sha512"
+    },
+    "System.Text.Json/8.0.5": {
+      "type": "package",
+      "serviceable": true,
+      "sha512": "sha512-0f1B50Ss7rqxXiaBJyzUu9bWFOO2/zSlifZ/UNMdiIpDYe4cY4LQQicP4nirK1OS31I43rn062UIJ1Q9bpmHpg==",
+      "path": "system.text.json/8.0.5",
+      "hashPath": "system.text.json.8.0.5.nupkg.sha512"
+    }
+  }
+}
\ No newline at end of file
diff --git a/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.dll b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.dll
new file mode 100644
index 0000000..1074df5
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.exe b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.exe
new file mode 100644
index 0000000..7afb3a0
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.exe differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.pdb b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.pdb
new file mode 100644
index 0000000..633517b
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.pdb differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.runtimeconfig.json b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.runtimeconfig.json
new file mode 100644
index 0000000..f76a63a
--- /dev/null
+++ b/QuizMaster/bin/Debug/net7.0-windows/QuizMaster.runtimeconfig.json
@@ -0,0 +1,18 @@
+{
+  "runtimeOptions": {
+    "tfm": "net7.0",
+    "frameworks": [
+      {
+        "name": "Microsoft.NETCore.App",
+        "version": "7.0.0"
+      },
+      {
+        "name": "Microsoft.WindowsDesktop.App",
+        "version": "7.0.0"
+      }
+    ],
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": true
+    }
+  }
+}
\ No newline at end of file
diff --git a/QuizMaster/bin/Debug/net7.0-windows/System.Data.SqlClient.dll b/QuizMaster/bin/Debug/net7.0-windows/System.Data.SqlClient.dll
new file mode 100644
index 0000000..a951eed
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/System.Data.SqlClient.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/System.Diagnostics.DiagnosticSource.dll b/QuizMaster/bin/Debug/net7.0-windows/System.Diagnostics.DiagnosticSource.dll
new file mode 100644
index 0000000..3dc9d1e
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/System.Diagnostics.DiagnosticSource.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/System.Security.Cryptography.Pkcs.dll b/QuizMaster/bin/Debug/net7.0-windows/System.Security.Cryptography.Pkcs.dll
new file mode 100644
index 0000000..faa3820
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/System.Security.Cryptography.Pkcs.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/System.Text.Encodings.Web.dll b/QuizMaster/bin/Debug/net7.0-windows/System.Text.Encodings.Web.dll
new file mode 100644
index 0000000..6a4a116
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/System.Text.Encodings.Web.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/System.Text.Json.dll b/QuizMaster/bin/Debug/net7.0-windows/System.Text.Json.dll
new file mode 100644
index 0000000..1033d32
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/System.Text.Json.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/browser/lib/net7.0/System.Text.Encodings.Web.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/browser/lib/net7.0/System.Text.Encodings.Web.dll
new file mode 100644
index 0000000..4eda309
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/browser/lib/net7.0/System.Text.Encodings.Web.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/unix/lib/net6.0/System.Data.SqlClient.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/unix/lib/net6.0/System.Data.SqlClient.dll
new file mode 100644
index 0000000..c3f49b9
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/unix/lib/net6.0/System.Data.SqlClient.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-arm64/native/sni.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-arm64/native/sni.dll
new file mode 100644
index 0000000..7b8f9d8
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-arm64/native/sni.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x64/native/sni.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x64/native/sni.dll
new file mode 100644
index 0000000..c1a05a5
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x64/native/sni.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x86/native/sni.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x86/native/sni.dll
new file mode 100644
index 0000000..5fc21ac
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win-x86/native/sni.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net6.0/System.Data.SqlClient.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net6.0/System.Data.SqlClient.dll
new file mode 100644
index 0000000..4b01d9e
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net6.0/System.Data.SqlClient.dll differ
diff --git a/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net7.0/System.Security.Cryptography.Pkcs.dll b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net7.0/System.Security.Cryptography.Pkcs.dll
new file mode 100644
index 0000000..4d9e023
Binary files /dev/null and b/QuizMaster/bin/Debug/net7.0-windows/runtimes/win/lib/net7.0/System.Security.Cryptography.Pkcs.dll differ
diff --git a/QuizMaster/obj/Debug/net7.0-windows/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs b/QuizMaster/obj/Debug/net7.0-windows/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs
new file mode 100644
index 0000000..4257f4b
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/.NETCoreApp,Version=v7.0.AssemblyAttributes.cs
@@ -0,0 +1,4 @@
+// <autogenerated />
+using System;
+using System.Reflection;
+[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(".NETCoreApp,Version=v7.0", FrameworkDisplayName = ".NET 7.0")]
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfo.cs b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfo.cs
new file mode 100644
index 0000000..c0334d9
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfo.cs
@@ -0,0 +1,25 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//     Runtime Version:4.0.30319.42000
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("QuizMaster")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("QuizMaster")]
+[assembly: System.Reflection.AssemblyTitleAttribute("QuizMaster")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+[assembly: System.Runtime.Versioning.TargetPlatformAttribute("Windows7.0")]
+[assembly: System.Runtime.Versioning.SupportedOSPlatformAttribute("Windows7.0")]
+
+// Generated by the MSBuild WriteCodeFragment class.
+
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfoInputs.cache b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfoInputs.cache
new file mode 100644
index 0000000..f2120a5
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.AssemblyInfoInputs.cache
@@ -0,0 +1 @@
+494fffa1eeb40e7e0419966a151483d3d31c2dba1ddb4309e45467716a0e9bf9
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Form1.resources b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Form1.resources
new file mode 100644
index 0000000..6c05a97
Binary files /dev/null and b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Form1.resources differ
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GeneratedMSBuildEditorConfig.editorconfig b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GeneratedMSBuildEditorConfig.editorconfig
new file mode 100644
index 0000000..1742e1b
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GeneratedMSBuildEditorConfig.editorconfig
@@ -0,0 +1,22 @@
+is_global = true
+build_property.ApplicationManifest = 
+build_property.StartupObject = 
+build_property.ApplicationDefaultFont = 
+build_property.ApplicationHighDpiMode = 
+build_property.ApplicationUseCompatibleTextRendering = 
+build_property.ApplicationVisualStyles = 
+build_property.TargetFramework = net7.0-windows
+build_property.TargetPlatformMinVersion = 7.0
+build_property.UsingMicrosoftNETSdkWeb = 
+build_property.ProjectTypeGuids = 
+build_property.InvariantGlobalization = 
+build_property.PlatformNeutralAssembly = 
+build_property.EnforceExtendedAnalyzerRules = 
+build_property._SupportedPlatformList = Linux,macOS,Windows
+build_property.RootNamespace = QuizMaster
+build_property.ProjectDir = D:\Source\QuizMaster\QuizMaster\
+build_property.EnableComHosting = 
+build_property.EnableGeneratedComInterfaceComImportInterop = 
+build_property.CsWinRTUseWindowsUIXamlProjections = false
+build_property.EffectiveAnalysisLevelStyle = 7.0
+build_property.EnableCodeStyleSeverity = 
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GlobalUsings.g.cs b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GlobalUsings.g.cs
new file mode 100644
index 0000000..84bbb89
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.GlobalUsings.g.cs
@@ -0,0 +1,10 @@
+// <auto-generated/>
+global using global::System;
+global using global::System.Collections.Generic;
+global using global::System.Drawing;
+global using global::System.IO;
+global using global::System.Linq;
+global using global::System.Net.Http;
+global using global::System.Threading;
+global using global::System.Threading.Tasks;
+global using global::System.Windows.Forms;
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Properties.Resources.resources b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Properties.Resources.resources
new file mode 100644
index 0000000..aa640d8
Binary files /dev/null and b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.Properties.Resources.resources differ
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.assets.cache b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.assets.cache
new file mode 100644
index 0000000..2931143
Binary files /dev/null and b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.assets.cache differ
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.AssemblyReference.cache b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.AssemblyReference.cache
new file mode 100644
index 0000000..809b551
Binary files /dev/null and b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.AssemblyReference.cache differ
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.BuildWithSkipAnalyzers b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.BuildWithSkipAnalyzers
new file mode 100644
index 0000000..e69de29
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.CoreCompileInputs.cache b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.CoreCompileInputs.cache
new file mode 100644
index 0000000..8d8248c
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.CoreCompileInputs.cache
@@ -0,0 +1 @@
+8712f44c8eee950bceab57adf5a77fda0756bc0f1b7366d94ebd5636f210a8d6
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.FileListAbsolute.txt b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.FileListAbsolute.txt
new file mode 100644
index 0000000..5c473a5
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.csproj.FileListAbsolute.txt
@@ -0,0 +1,46 @@
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\QuizMaster.exe
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\QuizMaster.deps.json
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\QuizMaster.runtimeconfig.json
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\QuizMaster.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\QuizMaster.pdb
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.Form1.resources
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.csproj.GenerateResource.cache
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.GeneratedMSBuildEditorConfig.editorconfig
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.AssemblyInfoInputs.cache
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.AssemblyInfo.cs
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.csproj.CoreCompileInputs.cache
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.dll
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\refint\QuizMaster.dll
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.pdb
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.genruntimeconfig.cache
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\ref\QuizMaster.dll
+D:\Source\Test-Jenkins\QuizMaster\obj\Debug\net7.0-windows\QuizMaster.Properties.Resources.resources
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\Microsoft.Extensions.DependencyInjection.Abstractions.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\Microsoft.Extensions.Logging.Abstractions.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\Npgsql.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\System.Data.SqlClient.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\System.Diagnostics.DiagnosticSource.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\System.Text.Encodings.Web.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\System.Text.Json.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\runtimes\win-arm64\native\sni.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\runtimes\win-x64\native\sni.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\runtimes\win-x86\native\sni.dll
+D:\Source\Test-Jenkins\QuizMaster\bin\Debug\net7.0-windows\runtimes\unix\lib\net6.0\System.Data.SqlClient.dll
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index 0000000..e69de29
diff --git a/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.designer.deps.json b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.designer.deps.json
new file mode 100644
index 0000000..ad26b99
--- /dev/null
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\ No newline at end of file
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new file mode 100644
index 0000000..1296a91
--- /dev/null
+++ b/QuizMaster/obj/Debug/net7.0-windows/QuizMaster.designer.runtimeconfig.json
@@ -0,0 +1,24 @@
+{
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+      "C:\\Users\\admin\\.nuget\\packages",
+      "C:\\Program Files (x86)\\Microsoft Visual Studio\\Shared\\NuGetPackages"
+    ],
+    "configProperties": {
+      "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": true,
+      "Microsoft.NETCore.DotNetHostPolicy.SetAppPaths": true
+    }
+  }
+}
\ No newline at end of file
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new file mode 100644
index 0000000..ff36acb
--- /dev/null
+++ b/QuizMaster/obj/QuizMaster.csproj.nuget.dgspec.json
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+}
\ No newline at end of file
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new file mode 100644
index 0000000..11be57d
--- /dev/null
+++ b/QuizMaster/obj/QuizMaster.csproj.nuget.g.props
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
+    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">$(MSBuildThisFileDirectory)project.assets.json</ProjectAssetsFile>
+    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\admin\.nuget\packages\;C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages</NuGetPackageFolders>
+    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
+    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">6.13.2</NuGetToolVersion>
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+  <ItemGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <SourceRoot Include="C:\Users\admin\.nuget\packages\" />
+    <SourceRoot Include="C:\Program Files (x86)\Microsoft Visual Studio\Shared\NuGetPackages\" />
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/QuizMaster/obj/QuizMaster.csproj.nuget.g.targets b/QuizMaster/obj/QuizMaster.csproj.nuget.g.targets
new file mode 100644
index 0000000..3a3fc90
--- /dev/null
+++ b/QuizMaster/obj/QuizMaster.csproj.nuget.g.targets
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <Import Project="$(NuGetPackageRoot)system.text.json\8.0.5\buildTransitive\net6.0\System.Text.Json.targets" Condition="Exists('$(NuGetPackageRoot)system.text.json\8.0.5\buildTransitive\net6.0\System.Text.Json.targets')" />
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+  </ImportGroup>
+</Project>
\ No newline at end of file
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new file mode 100644
index 0000000..128d0b0
--- /dev/null
+++ b/QuizMaster/obj/project.assets.json
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diff --git a/QuizMaster/obj/project.nuget.cache b/QuizMaster/obj/project.nuget.cache
new file mode 100644
index 0000000..6ff4169
--- /dev/null
+++ b/QuizMaster/obj/project.nuget.cache
@@ -0,0 +1,39 @@
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