Spegnimento del PC

[DllImport("user32.dll")]
static extern bool ExitWindowsEx(uint uFlags, uint dwReason);

[STAThread]
static void Main(string[] args)
{
ExitWindowsEx(ExitWindows.LogOff, ShutdownReason.MajorOther & ShutdownReason.MinorOther);
//this will cause the computer to logoff.

}