Hi, I write an ap on wince5 whitch use StreamInterfaceDriver class to creat file and do some IO control. If I press hardware key to enter suspend, then  system will hold. Is there any event that I can get to know system is going to enter suspend and I will close application first. Is it possible that....... please advise thank you.

Using the power management APIs you can be alerted when the system state changes, however you will not get the notification until the device wakes up again. This allows you to recover from the situation but you can't get advanced warning of a suspend.

Peter