How to prevent TextChanged event when dialog is loading

Question

I have a dialog in my Program with 2 textboxes; Path and Prefix. and the following event.

  Private Sub Path_TextChanged(sender As Object, e As EventArgs) Handles Path.TextChanged
        Prefix.Text = GetDefaultPrefix(Path.Text)
   End Sub

My Path has a default value which is set before showing the dialog.

I don't want GetDefaultPrefix to be called when the dialog is loading, but only afterwards when the Path value is being changed. Is it possible to do so?

Answer 1

You could add the old Boolean hack where you create a Boolean value set to True, in the Load event change the value to False, and in the TextChanged event only execute the code if the value is False:

Private is_startup As Boolean = True
Private Sub FormDialog_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    is_startup = False
End Sub

Private Sub Path_TextChanged(sender As Object, e As EventArgs) Handles Path.TextChanged
    If Not is_startup Then Prefix.Text = GetDefaultPrefix(Path.Text)
End Sub