Always close your connection in a Finally block. Leaving connections open will eventually crash your application during a lab viva. 5. Control Arrays and Loops
Dim original As String = txtInput.Text Dim reversed As String = StrReverse(original) If original.Equals(reversed, StringComparison.OrdinalIgnoreCase) Then lblStatus.Text = "It is a Palindrome" Else lblStatus.Text = "Not a Palindrome" End If Use code with caution. vb net lab programs for bca students fix
🚀 Focus on Try...Catch blocks. Lab examiners love to see that you’ve anticipated user errors! Always close your connection in a Finally block
Use Val() or Double.TryParse() to avoid "Conversion from string to type Double is not valid" errors when a user leaves a textbox empty. 2. Simple Interest Calculator Control Arrays and Loops Dim original As String = txtInput
Check if you have an infinite Do...While loop without an Application.DoEvents() .
Public Class Form1 Private Sub btnAdd_Click(sender As Object, e As EventArgs) Handles btnAdd.Click Try Dim num1 As Double = Val(txtFirst.Text) Dim num2 As Double = Val(txtSecond.Text) lblResult.Text = "Result: " & (num1 + num2).ToString() Catch ex As Exception MessageBox.Show("Please enter valid numbers.") End Try End Sub End Class Use code with caution.
This guide provides a curated list of essential lab programs with clean code and common fixes to ensure your projects run smoothly. 1. The Classic Calculator (Arithmetic Operations)