c# - How to detect when Windows 8 goes to sleep or resumes -

i have app keeps connection alive server, if user walks away , tablet goes sleep, handle disconnect gracefully, , log in when user wakes tablet.

i've tried in putting following code in connection class, never fired.

application.current.suspending += this.onappsuspending; application.current.resuming += this.onappresuming;; 

for desktop apps, can use systemevents.powermodechanged event know if windows going sleep state. don't know if works tablets too, can try it...

from msdn:

• resume operating system resume suspended state.

• statuschange power mode status notification event has been raised operating system. might indicate weak or charging battery, transition between ac power , battery, or change in status of system power supply.

• suspend operating system suspended.

systemevents.powermodechanged += onpowerchange;  private void onpowerchange(object s, powermodechangedeventargs e)  {     switch ( e.mode )      {         case powermodes.resume:          break;         case powermodes.suspend:         break;     } }