With this simple C# WinRT code you can get physical screen size on a Windows 8.1 Store app.
Why to prefer Windows.Storage over Isolated Storage in Windows Phone 8 apps: Thread safety.
Debugging Windows Phone apps and error “A specified communication resource (port) is already in use by another application.”
You can easily pass data between pages in a Windows Phone app with the help of Application.Resources.
How to fix Windows Phone Error “3100 An error has occurred”.
Windows Phone 7 has a anonymous user ID property called ANID. Windows Phone 8 replaced that with ANID2. This post shows how you can convert ANID to ANID2 in C#, using your publisher ID.