C# Program to Shutdown or Turn Off Computer

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Diagnostics; // add this namespace
namespace DemoConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            string filename = "", arguments = "", value = "";
            Console.WriteLine("\nShut Down\nRestart\nLogoff\nLock\nHibernation\nSleep\n\nEnter your Choice:");
            string oparation = Console.ReadLine();
            oparation = oparation.ToUpper(); // convert input into uppercase
            value = oparation.Trim(); // for remove whitespace from string
            switch (value)
            {
                case "SHUTDOWN":
                    filename = "shutdown.exe";
                    arguments = "-s";
                    break;
                case "RESTART":
                    filename = "shutdown.exe";
                    arguments = "-r";
                    break;
                case "LOGOFF":
                    filename = "shutdown.exe";
                    arguments = "-l";
                    break;
                case "LOCK":
                    filename = "Rundll32.exe";
                    arguments = "User32.dll, LockWorkStation";
                    break;
                case "HIBERNATION":
                    filename = @ "%windir%\system32\rundll32.exe";
                    arguments = "PowrProf.dll, SetSuspendState";
                    break;
                case "SLEEP":
                    filename = "Rundll32.exe";
                    arguments = "powrprof.dll, SetSuspendState 0,1,0";
                    break;
            }
            ProcessStartInfo startinfo = new ProcessStartInfo(filename, arguments);
            Process.Start(startinfo);
        }
    }
}