how to shutdown system in my app

how to call function to shotdown my system in my app. Can show me some sample code . thanks.

I found the follow code in MSDN->Shell, but how to enable it in VB.Net ?
Thanks.

VB Code:

Visual Basic:
 
Private Sub fnShellShutdownWindowsVB()
    Dim objShell As Shell
    
    Set objShell = New Shell
    objShell.ShutdownWindows
 
    Set objShell = Nothing
End Sub
Method Information
 
Minimum DLL version shell32.dll version 4.71 or later 
Minimum operating systems Windows 2000, Windows NT 4.0 with Internet Explorer 4.0, Windows 98, Windows 95 with Internet Explorer 4.0

The problem is some old ways won't work on new OS (2000 or XP) , Try this . It should work .http://www.vbforums.com/showthread.p...ghlight=logoff