If you need to kill the running application, regardless of state you can either use
Environment.Exit(0); // use -1 if you're exiting with an error, exiting with 0 is considered to have exited without errors.
Or if you really want to use the hammer
Environment.FailFast()
FailFast's documentation says:
Immediately terminates a process after writing a message to the Windows Application event log, and then includes the message in error reporting to Microsoft.
Use the FailFast method instead of the Exit method to terminate your application if the state of your application is damaged beyond repair, and executing your application's try/finally blocks and finalizers will corrupt program resources.