foreach in gridview row hiting twice while debugging

That would be my guess too, my 5.
I actually offered the simple way how to find it out in a regular way -- please see my answer.

(It feels so moving -- someone voted 4 for both our answers. It looks like we would get 5 if we pointed out a miraculous hidden grid view method setting some hidden property like "don't fire twice" :-)

I recently noted another funny observation from out inquirers: someone gets a compiler message like "You cannot do operation A". What's the most typical question in this case, usually put in the question's title? Of course, something like "How to do operation A?" (!!) Very moving childish logic! :-))

--SA