>The DataColumn class has a property AllowDBNull which addresses the non-
>null question. Also, you can use the Expression property in a calculated
>column to place conditional constraints for individual rows, or for all of
>the rows.
Thanks, Keith. I'll have to look at those.
Still curious about the behavior of the constraint class, though.
>>-Steve->>
Steve Sawyer
Geeks and Gurus, Inc.