Here's the fix: 

http://forums.asp.net/t/1262780.aspx

Gaucho :

This code gives error messages, can anyone tell me if this is correct or what the correct code should be?

What exactly do you need? your statement is a bit confusing

I also suspect that this line below generates the error because ItemSearch_Grid.SelectedIndex accepts only integer values but you are setting it a bool values..

  ItemSearch_Grid.SelectedIndex += ItemSearch_Check.Items(i).Selected

Actually, I posted the link to the fix for this at the top of this thread.