Vb Net Lab Programs For Bca Students Fix __link__ Jun 2026

Try ' The code that might cause an exception Dim result As Integer = 10 / numberFromUser Catch ex As Exception ' Code that runs if an exception occurs MessageBox.Show("An error occurred: " & ex.Message) Finally ' Code that ALWAYS runs, whether there was an error or not ' Good for closing files or database connections End Try

Try ' Code that might cause an error result = CInt(TextBox1.Text) / CInt(TextBox2.Text) Catch ex As DivideByZeroException MessageBox.Show("Cannot divide by zero!", "Error") Catch ex As FormatException MessageBox.Show("Please enter valid numbers.", "Error") Catch ex As Exception MessageBox.Show("An unexpected error occurred: " & ex.Message) Finally ' Code that always runs (cleanup) TextBox1.Clear() TextBox2.Clear() End Try vb net lab programs for bca students fix

' Reading from file Try Dim reader As StreamReader = New StreamReader(path) text = reader.ReadToEnd() reader.Close() Console.WriteLine("File Content:") Console.WriteLine(text) Catch ex As Exception Console.WriteLine("Read Error: " & ex.Message) End Try Try ' The code that might cause an

| Issue | Symptoms | Solution | |-------|----------|----------| | NullReferenceException with objects | “Object reference not set to an instance of an object” | Ensure you use Dim obj As New ClassName() before accessing members | | Shared vs instance confusion | Method calls don’t work as expected | Remember: shared methods can be called without an instance ( ClassName.Method() ), instance methods require an object ( obj.Method() ) | | Access level violations | Compiler errors about inaccessible members | Review Public , Private , Friend , and Protected keywords | | Constructor not firing | Properties not initialized | Verify the Sub New() is Public and not overridden | vb net lab programs for bca students fix

If isPrime Then MessageBox.Show(num & " is a Prime Number") Else MessageBox.Show(num & " is NOT a Prime Number") End If Else MessageBox.Show("Enter a valid integer") End If End Sub End Class

Double-click the button and add this validation logic: