winforms-sql-connection [BRONIOLA]

TestWins/Form1.cs

@@ -1,5 +1,6 @@
 using System.Drawing.Text;
 using TestWins.Controller;
+using TestWins.Model;
 
 namespace TestWins;
 
@@ -8,36 +9,95 @@ public partial class Form1 : Form
     //business
 
     private readonly StudentController controller = new StudentController();
+
     public Form1()
     {
         InitializeComponent();
-        loadData();
-    }
 
     private void loadData()
     {
+        dataGridView1.DataSource = null;
         dataGridView1.DataSource = controller.getAll();
     }
 
     private void btnAdd_Click(object sender, EventArgs e)
     {
+        try
+        {
+            Student s = new Student
+            {
+                Name = txtName.Text,
+                age = int.Parse(txtAge.Text),
+                course = txtCourse.Text
+            };
 
+            controller.createStudent(s);
+            loadData();
+            clearFields();
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show("Error: " + ex.Message);
+        }
     }
 
     private void btnUpdate_Click(object sender, EventArgs e)
     {
+        try
+        {
+            Student s = new Student
+            {
+                studentId = txtStudentId.Text,
+                Name = txtName.Text,
+                age = int.Parse(txtAge.Text),
+                course = txtCourse.Text
+            };
 
+            controller.update(s);
+            loadData();
+            clearFields();
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show("Update Error: " + ex.Message);
+        }
     }
 
     private void btnDelete_Click(object sender, EventArgs e)
     {
+        try
+        {
+            controller.delete(txtStudentId.Text);
+            loadData();
+            clearFields();
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show("Delete Error: " + ex.Message);
+        }
+    }
 
+    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
+    {
+        if (e.RowIndex >= 0)
+        {
+            var row = dataGridView1.Rows[e.RowIndex];
 
 
+            txtStudentId.Text = row.Cells["studentId"].Value.ToString();
+            txtName.Text = row.Cells["Name"].Value.ToString();
+            txtAge.Text = row.Cells["age"].Value.ToString();
+            txtCourse.Text = row.Cells["course"].Value.ToString();
+        }
     }
 
     private void dataGridView1_CellClick(object sender, EventArgs e)
+    private void clearFields()
     {
 
+        txtStudentId.Text = "";
+        txtName.Text = "";
+        txtAge.Text = "";
+        txtCourse.Text = "";
     }
 }

TestWins/model/ConnectionSql.cs

@@ -1,22 +1,29 @@
-namespace TestWins.Model;
-
-//dotnet add package MySql.Data
 using MySql.Data.MySqlClient;
 
-public class ConnectionSql
+namespace TestWins.Model
 {
-    private readonly string _connectionString = "server=localhost;database=student;uid=root;pwd=root";
-        private MySqlConnection _conn;
-
-    public MySqlConnection connectSql()
+    public class ConnectionSql
     {
+        private readonly string _connectionString = "server=localhost;database=student;uid=root;pwd=root";
 
-        Console.WriteLine("Connecting to DB");
+        public MySqlConnection connectSql()
+        {
+            try
+            {
+                Console.WriteLine("Connecting to DB");
 
-        _conn = new MySqlConnection(_connectionString);
+                MySqlConnection conn = new MySqlConnection(_connectionString);
+                conn.Open();
 
-        Console.WriteLine(_conn == null ? "Datbase Connection Failed" : "Database connection successful");
+                Console.WriteLine("Database connection successful");
 
-        return _conn;
+                return conn;
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine("Database connection failed: " + ex.Message);
+                throw;
+            }
+        }
     }
-}
+}