winforms-sql-connection [BADILLES]

TestWins/UpdateForm1.cs

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+using System.Drawing.Text;
+using TestWins.Controller;
+namespace TestWins;
+public partial class Form1 : Form
+{
+    private readonly StudentController controller = new StudentController();
+
+    public Form1()
+    {
+        InitializeComponent();
+        loadData();
+    }
+
+    private void loadData()
+    {
+        dataGridView1.DataSource = controller.getAll();
+    }
+
+    private void btnAdd_Click(object sender, EventArgs e)
+    {
+        var student = new TestWins.Model.Student
+        {
+            studentId = txtStudentId.Text,
+            Name = txtName.Text,
+            age = int.Parse(txtAge.Text),
+            course = txtCourse.Text
+        };
+        controller.createStudent(student);
+        loadData();
+        clearFields();
+    }
+
+    private void btnUpdate_Click(object sender, EventArgs e)
+    {
+        var student = new TestWins.Model.Student
+        {
+            studentId = txtStudentId.Text,
+            Name = txtName.Text,
+            age = int.Parse(txtAge.Text),
+            course = txtCourse.Text
+        };
+        controller.update(student);
+        loadData();
+        clearFields();
+    }
+
+    private void btnDelete_Click(object sender, EventArgs e)
+    {
+        controller.delete(txtStudentId.Text);
+        loadData();
+        clearFields();
+    }
+
+    private void dataGridView1_CellClick(object sender, EventArgs e)
+    {
+        if (dataGridView1.CurrentRow != null)
+        {
+            DataGridViewRow row = dataGridView1.CurrentRow;
+            txtStudentId.Text = row.Cells[0].Value.ToString();
+            txtName.Text = row.Cells[1].Value.ToString();
+            txtAge.Text = row.Cells[2].Value.ToString();
+            txtCourse.Text = row.Cells[3].Value.ToString();
+        }
+    }
+
+    private void clearFields()
+    {
+        txtStudentId.Text = "";
+        txtName.Text = "";
+        txtAge.Text = "";
+        txtCourse.Text = "";
+    }
+}   

TestWins/model/UpdateConnectionSql.cs

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+namespace TestWins.Model;
+
+//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;
+
+        public MySqlConnection connectSql()
+        {
+            Console.WriteLine("Connecting to DB");
+
+            _conn = new MySqlConnection(_connectionString);
+            _conn.Open();
+
+            Console.WriteLine(_conn.State == System.Data.ConnectionState.Open
+                ? "Database connection successful"
+                : "Database Connection Failed");
+
+            return _conn;
+        }
+    }