Hi,<br>It's the second time I ask this, but this time I've put a more descriptive subject!<br><br>I've 2 fields : the area_ID and the Surface. They are both in the same table (tblArea).<br>So, when user enter the area, in the AfterUpdate event I write the following code to updated the field Surface instantly:<br><br><font color=red>Private Sub area_ID_AfterUpdate()<br> [Surface] = DLookup("area_surface", "tblArea", "area =[area_ID]"<br>End Sub</font><br><br><br>The Surface should appears in the surface field of my form, no? What's wrong with this code? Is this the good way to make it?<br><br>Any help is welcome,<br>Cantor