We have so far created a simple app with two pages, that uses simple Frame navigation to go back and forth. However, the app is still missing one crucial feature: state management. When an app is suspended for whatever reason (such as being minimized on the desktop or navigated away from on the phone), it is up to the developer to maintain the current state so that it can be fully restored where the user left off.
In this post we’ll look at a simple way we can achieve this by leveraging helper classes from the Windows 8.1 project templates.
Read more at the Falafel Software Blogs: Windows 10 Development: Maintaining Application State>