This is purely a guess on my part, but perhaps you might consider using VirtualAlloc instead of HeapAlloc? Maybe the VirtualAlloc will be able to provide all the memory you need without OutOfMemory exceptions. -------------------------------- "All that is necessary for the forces of evil to win in the world is for enough good men to do nothing" -- Edmund Burke

Exactly. Thanks. I am such a dumb. Anyway thanks for your help.

Thanks for the reply. Actually IsDate is not available in SYBASE. So I had to write custom validation. Thanks again.

I figured it out. currencyManager.Current is the one I was looking for.

Ohhh, ok.. well thanks for the info then and I'm happy to help (even a little) :)

I've the same issue, did you implemented the Algo to search a specific item on keys down, if so kindly guide me!! Abdullah

Thanks a lot for the reply. I tried this before, but I want the DataGrid to do the actual validation but I want to give a custom message. But in case of the solution you have specified, the DataGrid itself shows a MessageBox with a message which is not use friendly.