Vb Net Lab Programs For Bca Students Fix -

Try ' Code that might fail Catch ex As Exception MessageBox.Show(ex.Message) End Try Use code with caution. Conclusion

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

Validate input fields (e.g., email, mobile number) and handle button click events. vb net lab programs for bca students fix

(10 Marks): Design a VB.NET application to calculate the area of a circle, rectangle, and triangle using radio buttons and a single compute button. Implement appropriate input validation.

Use Microsoft Visual Studio (Community Edition 2019 or later is recommended). Project Setup for Console Applications: →right arrow →right arrow Select Visual Basic →right arrow Console Application (.NET Framework). Project Setup for GUI Apps: →right arrow →right arrow Select Visual Basic →right arrow Windows Forms App (.NET Framework). Try ' Code that might fail Catch ex As Exception MessageBox

Private Sub btnInsert_Click(sender As Object, e As EventArgs) Handles btnInsert.Click ' Step 1: Connection string Dim connString As String = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\BCA_Lab\CollegeDB.accdb" Dim conn As New OleDbConnection(connString)

: 2 TextBoxes, 4 Buttons, 1 Label (for result), 1 Label (for error display). (10 Marks): Design a VB

If your loop crashes, type ? i to see the counter value. If it's 999 instead of 10, you found the bug.