Unique constraint on multiple columns

I have a unique constraint on two columns in a typed dataset. I've looked in the designer code and it is there. But nothing happens when it is violated. The single column unique constraints are fine. Anyone have this problem before? Any suggestions? TIA.
[256 byte] By [Sarah] at [2008-1-1]
# 1
Correction, the single column unique constraints work on all other tables in the dataset but this one.
Sarah at 2007-9-12 > top of Msdn Tech,Windows Forms,Windows Forms Data Controls and Databinding...