Is there any event in windows universal app (wp8.1&win8.1) that fires when screen locked and unlocked with in the app?

Hi All,
Is there any event in windows universal app (wp8.1&win8.1) that fires when screen locked and unlocked with in the app
Right now, I am using this below mentioned event
Window.Current.VisibilityChanged +=
CurrentWindow_VisibilityChanged;, but it fires even when app relaunches.
Please anybody help me to solve this issue.

Thanks for your early reply. but, those are system triggers used in background task. I want an event that fires when screen gets locked. like this...(a networkstatuschangedevent)
NetworkStatusChangedEventHandler
networkStatusCallback =
newNetworkStatusChangedEventHandler(OnNetworkStatusChange);

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Is there any event in windows universal app (wp8.1&win8.1) that fires when screen locked and unlocked with in the app?

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