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 help shutdown in the Command Prompt.
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");
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Code to Shutdown or Restart the Computer Using C#
ProcessStartInfo startinfo = new ProcessStartInfo(“shutdown.exe”, “-s”);
Process.Start(startinfo);