Using System.Diagnostics;

{
    Process.Start("Shutdown", "-i");
}

WinPower.Execute(WinPower.PowerOption.PowerOff);
WinPower.Execute(WinPower.PowerOption.Reboot);
WinPower.Execute(WinPower.PowerOption.Sleep);
WinPower.Execute(WinPower.PowerOption.Hibernate);

rundll32.exe powrprof.dll,SetSuspendState 0,1,1 // dormir
rundll32.exe powrprof.dll,SetSuspendState 1,1,1 // hibernar