Students Fix _hot_ | Vb Net Lab Programs For Bca

Do you need assistance with (MDI Forms, Menus, DataGrids)?

If you are working on a specific lab assignment or encountering a tricky compiler error, let me know:

To insert data into a SQL Server database. This is a critical BCA lab component. vb net lab programs for bca students fix

Catch ex As Exception MessageBox.Show("Error: " & ex.Message) Finally con.Close() ' Always close connection End Try End Sub

These are usually your first assignments: calculating area, reversing a number, checking for palindromes, or finding primes. Do you need assistance with (MDI Forms, Menus, DataGrids)

GUI applications form the core practical component of BCA external examinations. Program 5: Simple Calculator

Imports System.Data.SqlClient ' Use System.Data.OleDb for MS Access (.accdb) Public Class DatabaseForm ' Update the Connection String according to your SQL Server instance Private connString As String = "Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=BCALabDB;Integrated Security=True" Private Sub LoadData() Using conn As New SqlConnection(connString) Dim query As String = "SELECT * FROM Students" Using adapter As New SqlDataAdapter(query, conn) Dim ds As New DataSet() Try conn.Open() adapter.Fill(ds, "Students") dgvData.DataSource = ds.Tables("Students") Catch ex As Exception MessageBox.Show("Error loading data: " & ex.Message) End Try End Using End Using End Sub Private Sub DatabaseForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load LoadData() End Sub Private Sub btnInsert_Click(sender As Object, e As EventArgs) Handles btnInsert.Click Dim id As Integer Dim name As String = txtName.Text.Trim() If Not Integer.TryParse(txtId.Text, id) OrElse String.IsNullOrEmpty(name) Then MessageBox.Show("Please fill out all fields with valid data.") Exit Sub End If Dim query As String = "INSERT INTO Students (StudentId, StudentName) VALUES (@Id, @Name)" Using conn As New SqlConnection(connString) Using cmd As New SqlCommand(query, conn) cmd.Parameters.AddWithValue("@Id", id) cmd.Parameters.AddWithValue("@Name", name) Try conn.Open() Dim rows As Integer = cmd.ExecuteNonQuery() If rows > 0 Then MessageBox.Show("Record Inserted Successfully!") txtId.Clear() txtName.Clear() LoadData() ' Refresh GUI grid End If Catch ex As Exception MessageBox.Show("Database Error: " & ex.Message) End Try End Using End Using End Sub End Class Use code with caution. Compilation and Execution Blueprint Catch ex As Exception MessageBox

' Use Parameters to prevent SQL Injection cmd.Parameters.AddWithValue("@id", Integer.Parse(txtID.Text)) cmd.Parameters.AddWithValue("@name", txtName.Text) cmd.Parameters.AddWithValue("@course", txtCourse.Text)