Using Resume or Resume Next to control application flow post-error. Conclusion and Next Steps
Private Sub btnAdd_Click() If txtItem.Text <> "" Then List1.AddItem txtItem.Text txtItem.Text = "" ' Clear input box txtItem.SetFocus ' Reset cursor End If End Sub Use code with caution.
Private Sub cmdAdd_Click() If ValidateInputs() Then Dim result As Double result = CDbl(txtNum1.Text) + CDbl(txtNum2.Text) lblResult.Caption = "Result: " & CStr(result) lblResult.ForeColor = vbBlue End If End Sub Private Sub cmdSubtract_Click() If ValidateInputs() Then Dim result As Double result = CDbl(txtNum1.Text) - CDbl(txtNum2.Text) lblResult.Caption = "Result: " & CStr(result) lblResult.ForeColor = vbGreen End If End Sub Private Sub cmdMultiply_Click() If ValidateInputs() Then Dim result As Double result = CDbl(txtNum1.Text) * CDbl(txtNum2.Text) lblResult.Caption = "Result: " & CStr(result) lblResult.ForeColor = vbMagenta End If End Sub Private Sub cmdDivide_Click() If ValidateInputs() Then If CDbl(txtNum2.Text) = 0 Then MsgBox "Error: Division by zero is not allowed.", vbCritical, "Math Error" Exit Sub End If Dim result As Double result = CDbl(txtNum1.Text) / CDbl(txtNum2.Text) lblResult.Caption = "Result: " & CStr(result) lblResult.ForeColor = vbRed End If End Sub Private Sub cmdClear_Click() txtNum1.Text = "" txtNum2.Text = "" lblResult.Caption = "Result: " lblResult.ForeColor = vbBlack txtNum1.SetFocus End Sub Private Function ValidateInputs() As Boolean If Not IsNumeric(txtNum1.Text) Or Not IsNumeric(txtNum2.Text) Then MsgBox "Please enter valid numeric values.", vbExclamation, "Input Validation" ValidateInputs = False Else ValidateInputs = True End If End Function Use code with caution. Module 2: Data Types, Control Structures, and Arrays
To truly understand this language, hands-on practice is essential. This comprehensive guide outlines the core concepts of VB6, provides practical exercises you can build right now, and directs you toward the best downloadable PDF workbooks for offline study. Why Practice Visual Basic 6.0 Today?
Private Sub chkBold_Click() If chkBold.Value = vbChecked Then lblText.FontBold = True Else lblText.FontBold = False End If End Sub Use code with caution.
Master If...Then...Else and Select Case conditional structures.
Visual Basic 6.0 (VB6) remains one of the most successful programming languages in software history. Released by Microsoft in 1998, its rapid application development (RAD) engine still runs critical legacy systems worldwide. Whether you are a student preparing for a lab exam or a developer maintaining enterprise software, practicing with real-world scenarios is the best way to master VB6.