The easiest way to shutdown, restart, or hibernate a computer programmatically using C# is to use the shutdown command-line tool that comes with Windows. This tool has a lot of options, for example /l logs of the user, /s shuts down the computer, /r restarts the computer, and /h hibernates the computer. To get the full list of available options, type the following in the Command Prompt:
help shutdown
To execute shutdown from C# use the follow statement:
//the first parameter is the command, and the second is its arguments
System.Diagnostics.Process.Start("shutdown", "/s");