append files

[C# Programming]

I have an application that crunches lots of data and during the processing, the
application crashes and I get a message that says "fileappend function failed."

I am not a programmer and hope I have the right forum. My apologies if I have
the wrong one...if I do, please direct me to the proper forum.

Any ideas on how to correct this problem will be greatly appreciated.

Pete Brittain