Lock My Computer Programmatically in C#?

The following code is used to Lock a Computer programmatically. It is nothing but calling a hook on the user32.dll library and commands also exist for shut down, log off, restart...

Process.Start(@"C:\WINDOWS\system32\rundll32.exe",
     "user32.dll,LockWorkStation");            

Addional information on how to use .NET Process class can be found at MSDN or by following the link below.

Process Class Documentation