Coming from Windows Phone 8 I never thought there will be a lot of changes done to the Windows Phone 8.1 code. Basically I'm just wondering how to do page navigation just like how you would do it on Windows Phone 8. To do that You would add:

NavigationService.Navigate(new Uri("/SecondPage.xaml", UriKind.Relative));

But that code doesn't work for Windows Phone 8.1. Can someone please help me with this. If possible provide any links or documentation on all the NEW WINDIWS PHONE 8.1 methods.