Visual Basic - How do I make a subroutine run in an if statement?

Here is the code:

If txtUserLength.Text = "" Then
MsgBox("Please enter a Length")
ElseIf txtUserWidth.Text = "" Then
MsgBox("Please enter a Width")
ElseIf txtUserLength.Text = "" And txtUserWidth.Text = "" Then
MsgBox("Please enter both Width and Length")
End If

After each message box, I want the program to go to a subroutine which clears all of the labels and text boxes. The subroutine is called:

Private Sub btnClear_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnClear.Click

Thanks.


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