Validate two check boxes in a same row in the datagrid

Hi,

I have a datagrid,in that i have some columns and 2 checkbox column.If i click 2 checkbox in the same row it has to through error........

But if i click those 2 checkbox from a different rows ex. 1st checkbox from 3rd row and 2nd checkbox from 5th row .. then it shouldnt through any errors.........

kokilasambandam@gmail.com....

Plz can you help me..

Thanks!