Hi,<br><br>I have a table in access associated with a form that i use to enter data into the table. One textbox in my table is bounded to field "PO Number" and I have used this code to force data entry into the PO field:<br><br>Private Sub Form_AfterUpdate()<br>If Me![Text2] = "" Or IsNull(Me![Text2]) Then<br> MsgBox "Please key in The PO Number.", vbExclamation, "Missing Info"<br> Me![Text2].SetFocus<br> Exit Sub<br> End If<br><br><br>This one works great, but now I just realized another problem: Users have been typing PO numbers with missing characters. The PO format has to be like this:<br><br>1234567ABCD = 7 numbers and 4 letters<br><br>How to force the textbox to validate and make sure this format is used, and also let the user know with some sort of a custom Msg box???? Thanks!!