How to Destroy previous page while doing page Navigation in Windows Store Apps

On navigating from one page to another page in windows store app all objects and previous page still in memory,
also the app memory keeps on increasing on switching tabs and switching pages even unregistering unused events and using GC.Collect. App crashes on continuous usage ,
Can anyone suggest an option to clean unwanted memory.

from Windows Central Forums http://ift.tt/2cxEfHX
via IFTTT