winforms-sql-connection [VINZON]

TestWins/Form1.cs

@@ -1,5 +1,7 @@
 using System.Drawing.Text;
+using System.Xml.Linq;
 using TestWins.Controller;
+using TestWins.Model;
 
 namespace TestWins;
 
@@ -8,6 +10,7 @@ public partial class Form1 : Form
     //business
 
     private readonly StudentController controller = new StudentController();
+
     public Form1()
     {
         InitializeComponent();
@@ -21,23 +24,53 @@ private void loadData()
 
     private void btnAdd_Click(object sender, EventArgs e)
     {
+        var student = new Student
+        {
+            Id = int.Parse(txtId.Text),
+            Name = txtName.Text,
+            Course = txtCourse.Text,
+            Year = int.Parse(txtYear.Text)
+        };
 
+        controller.create(student);
+        loadData();
     }
 
     private void btnUpdate_Click(object sender, EventArgs e)
     {
+        var student = new Student
+        {
+            Id = int.Parse(txtId.Text),
+            Name = txtName.Text,
+            Course = txtCourse.Text,
+            Year = int.Parse(txtYear.Text)
+        };
 
+        controller.update(student);
+        loadData();
     }
 
     private void btnDelete_Click(object sender, EventArgs e)
     {
+        int id = int.Parse(txtId.Text);
 
 
 
+        controller.delete(id);
+        loadData();
     }
 
     private void dataGridView1_CellClick(object sender, EventArgs e)
+    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
     {
+        if (e.RowIndex >= 0)
+        {
+            DataGridViewRow row = dataGridView1.Rows[e.RowIndex];
 
+            txtId.Text = row.Cells["Id"].Value.ToString();
+            txtName.Text = row.Cells["Name"].Value.ToString();
+            txtCourse.Text = row.Cells["Course"].Value.ToString();
+            txtYear.Text = row.Cells["Year"].Value.ToString();
+        }
     }
 }

TestWins/model/ConnectionSql.cs

@@ -1,12 +1,14 @@
 namespace TestWins.Model;
 
 //dotnet add package MySql.Data
+// dotnet add package MySql.Data
 using MySql.Data.MySqlClient;
 
 public class ConnectionSql
 {
     private readonly string _connectionString = "server=localhost;database=student;uid=root;pwd=root";
         private MySqlConnection _conn;
+    private MySqlConnection _conn;
 
     public MySqlConnection connectSql()
     {
@@ -16,7 +18,25 @@ public MySqlConnection connectSql()
         _conn = new MySqlConnection(_connectionString);
 
         Console.WriteLine(_conn == null ? "Datbase Connection Failed" : "Database connection successful");
+        try
+        {
+            _conn.Open();
+            Console.WriteLine("Database connection successful");
+        }
+        catch (Exception ex)
+        {
+            Console.WriteLine("Database connection failed: " + ex.Message);
+        }
+return _conn;
+    }
 
         return _conn;
+    public void closeSql()
+    {
+        if (_conn != null && _conn.State == System.Data.ConnectionState.Open)
+        {
+            _conn.Close();
+            Console.WriteLine("Database connection closed");
+        }
     }
-}
+}