You can add a method to a Web user control as you would to any class; just place the implementation of that method into the user control's code. You can make the method public, protected, or private; see "Creating Methods" in Chapter 11 for more details.
For example, in the WebUserControls example discussed in the In Depth section of this chapter, we added a method named SetText that set the text displayed in the Web user control. Here's what that method looks like:
Public Sub SetText(ByVal NewText As String) Label1.Text = NewText End Sub
For more details on how this example works, and the SetText method, take a look at the In Depth section of this chapter.