Prompt user to save when closing app

Question

I\'m writing what boils down to a document editor. When the application is closing, I need to prompt the user to save changes. This is easy enough. My question is when is it

Answer 1

I think TaskManagerClosing should be the only reason that does not prompt, if any. Personally, I would want to be prompted in the event of WindowsShutDown. If I'm shutting down Windows with an unsaved document somewhere, it means I've forgotten about it.