C# - How to detect a Windows shutdown/logoff and cancel that action (after asking the user)

Question

Some explanation: for a project I\'m working on I have to write a program that is running in the background, detects changes to files, and uploads the modified files to a we

Answer 1

Trying to block a shutdown is a lossy proposition these days, it's no longer possible to do so in Vista and up. A prompt isn't readable nor reachable. Using a service is highly indicated here, lets you survive a user log-off. And a reboot, your service will start running again automatically, letting you complete the job.