Assuming you have two textboxes: Text1 and Text2. In the AfterUpdate Event
of Text1, put:
Me.Text2 = Me.Text1
However, a better question is: why would you want to do this? There are
very few legitmate times when you want to duplicate values. If it is stored
in one field, you can simply use this value in a query or form or report
without storing it a second time.
