Hi, i founded this free app. It's name is "SCREEN OFF".
This is the link to download it and wacth it:
[url removed, login to view]
Here the description:
This application simply turns off the screen on the device, without putting it to sleep. Can be useful to save battery life when connecting the device to the PC or when running an application that doesn't need the display (like an audio player).
Tested on HTC Touch HD with WM 6.1 and 6.5.3.
It DOES NOT require .NET Compact Framework. Just install the cab and launch the shortcut from Programs.
I want you build exactly the same app with source codes for VISUAL STUDIO 2008.
I added the app, look it.