First functioning as a Windows Phone Class Library.

Tested the MainClass.TestDb() method in a Windows Phone App context, and that's working.

Only real issue, and it masqueraded a bit behind other lines, was that
    System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal)
isn't supported in Windows Phone, and I had to use
    ApplicationData.Current.LocalFolder.Path
instead.