wierd delegate? problem

[piercy]

Hi, i am having trouble with a certain delegate in my program. I run through my app and double click cell which fire and event calling the delegate. The delegate then moves on an pulls back the next set of data. this works. Then, when i go back, double click the cell again it fails with: Specified argument was out of the range of valid values. Parameter name: rowIndex.

i have no idea where this error is coming from. If i try to break point the code works fine an has no problems. The other interesting thing is. There the double click event to do the next movement but theres also a btnNext click. The btnNext_Click event calls the exact same function as the delegate but just does not use the delegate. This works fine. back and forth using back and next works ok, its just on the delegate it errors. I have included the link below to show the source i think is relevent. below it is another small description of the issue.

Paste2: Next Generation Pastebin - Viewing Paste 107176

Any help with this is greatly appreciated,
Many Thanks,
Piercy

[piercy]

Think i've found the issue. The DataGridView i am using is a third party control (Krypton Toolkit). after replacing the DataGridView with a standard Windows Forms one it works fine.

Thanks for the help if anyone was trying already.

Piercy