Controls As Arguments

In the previous section, you have seen how variables can be passed between procedures. Variables are not the only kind of data you can pass between procedures. You can pass controls also. The control can be any one of the following types:

CheckBox Image PictureBox OptionButton Rectangle ComboBox Label OptionGroup Shape CommandButton Line PageBreak TextBox Graph ListBox ToggleButton

A function may receive a control variable like this:

Public Function MyControls (obj As Object)

If a function receives an argument declared as the Object data type, you can test the kind of control the argument holds with the help of TypeOf:

If TypeOf obj Is CommandButton Then
  'Code for handling Command Button
ElseIf TypeOf obj Is CheckBox Then
  'Code for handling Check Box
End If