Private Sub NumberButtons_Click(sender As Object, e As EventArgs) Handles btn1.Click, btn2.Click, btn3.Click Dim b As Button = DirectCast(sender, Button) txtDisplay.Text &= b.Text End Sub Use code with caution. Troubleshooting Tips for Lab Exams
VB.NET doesn't support control arrays like VB6, so students must learn to use collections or handle multiple events with one subroutine. Use the Handles clause for multiple buttons. vb net lab programs for bca students fix
Always use StringComparison.OrdinalIgnoreCase . Without it, "Madam" will be marked as "Not a Palindrome" because of the capital 'M'. 4. Database Connectivity (ADO.NET) Always use StringComparison
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 Database Connectivity (ADO
Most students fail here because of the file path. Use a relative path or the |DataDirectory| macro. The Code Snippet:
This program helps students understand string functions like StrReverse and case sensitivity.
Ensure your labels are cleared or reset when a "Clear" button is clicked to prevent old data from confusing the user. 3. Palindrome Checker (String Manipulation)