taller visual basic

codigo:
Private Sub cmddivision_Click()
lbloperacion.Caption = "/"
End Sub

Private Sub cmdmultiplicacion_Click()
lbloperacion.Caption = "*"
End Sub

Private Sub cmdresta_Click()
lbloperacion.Caption = "-"
End Sub

Private Sub cmdresultado_Click()
If lbloperacion = "+" Then
lblresultado.Caption = Val(txtval1.Text) + Val(txtval2.Text)
Else
If lbloperacion = "-" Then
lblresultado.Caption = Val(txtval1.Text) - Val(txtval2.Text)
Else
If lbloperacion = "*" Then
lblresultado.Caption = Val(txtval1.Text) * Val(txtval2.Text)
Else
If lbloperacion = "/" Then
lblresultado.Caption = Val(txtval1.Text) / Val(txtval2.Text)
End If
End If
End If
End If
End Sub


Private Sub cmdsuma_Click()
lbloperacion.Caption = "+"
End Sub