How to poweroff android mobile [duplicate]

Possible Duplicate:

How to power off an Android device?

I have a requirement to implement power-off functionality on android. I am unable to get that. Is there anything I can call then my mobile will power-off. How do I write code to power-off?

Thanks

Sorry, there is no way to do it !

I found there is no API in the Android SDK to allow user apps to do this. Force the device to go to sleep using PowerManager.goToSleep()