C# Program Modification

I have a widget, and the source, written in C# and I need a modification. I need a script written so that the program responds to a Windows close/shut down request and allows windows to shut down. You can either input the script into my source code, or you can send me the script and tell me in which module and folder to put the script. ## Deliverables The only other detail I can provide is that several clients have Spanish based Windows, other than that this should be quick and easy for a skilled programmer.