Shut Down, Restart, Log off, Lock, Hibernate or Sleep Your Computer in C#

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Introduction

In this tip, I'll tell you how to shut down, restart, log off or lock your computer in C#.

Using the Code

First, add this using namespace statements:

using System.Diagnostics;
using System.Runtime.InteropServices; 

To shut down your computer, use this code:

Process.Start("shutdown","/s /t 0");    // starts the shutdown application 
                                        // the argument /s is to shut down the computer
                                        // the argument /t 0 is to tell the process that 
                                        // the specified operation needs to be completed 
                                        // after 0 seconds

To restart your computer, use this code:

Process.Start("shutdown", 
"/r /t 0"); // the argument /r is to restart the computer

To log off, add this extern method to your class:

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

Then, to log off, invoke the method:

ExitWindowsEx(0,0);

To lock your computer, add this extern method to your class:

[DllImport("user32")]
public static extern void LockWorkStation();

Then, to lock, invoke the method:

LockWorkStation(); 

To put your computer in Hibernate or Sleep, you need the same DllImport statement for them. Thanks to Virender Prajapati for suggesting to add these!

[DllImport("PowrProf.dll", CharSet = CharSet.Auto, ExactSpelling = true)]
public static extern bool SetSuspendState(bool hiberate, bool forceCritical, bool disableWakeEvent);

To bring your computer into Hibernate:

SetSuspendState(true, true, true);

And to bring it into sleep:

SetSuspendState(false, true, true);