WindowsPhone 8.0 vs WindowsPhone 8.1: Alternative way to get screen resolutions(C#-XAML)

Introduction:

There may be many cases ,in which you need to supply higher quality images that should be fit into current device screen resolutions and its makes nice attractions for app users. Fortunately windowsphone is very good at detecting screen resolutions.However previously in windowsphone 8.0,to determine screen resolutions we are using the "App.Current.Host.Content.ScaleFactor" .But now its not working in windowsphone 8.1,So this post is explained about what is the alternative way for detecting screen resolutions in windowsphone store 8.1.