Checking for workstation lock/unlock change with c#

Question

DUPLICATE: How can I programmatically determine if my workstation is locked?

How can I detect (during runtime) when a Windows user has locked their

Answer 1

You can get this notification via a WM_WTSSESSION_CHANGE message. You must notify Windows that you want to receive these messages via WTSRegisterSessionNotification and unregister with WTSUnRegisterSessionNotification.

These posts should be helpful for a C# implementation.

http://pinvoke.net/default.aspx/wtsapi32.WTSRegisterSessionNotification

http://blogs.msdn.com/shawnfa/archive/2005/05/17/418891.aspx

http://bytes.com/groups/net-c/276963-trapping-when-workstation-locked