How to do validation according to one column value .

Apr 1, 2009 at 7:23 AM
I've used WPF Toolkit datagrid. And some simple validation works fine .
My question is :
For example , my datagrid has 2 columns .
The value of column2 need do validation according to the value of column1  .
How can I do that ?

Thanks for any advice or example .