private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            //If no database exists this will create it with Code First, otherwise this does nothing.
            CreateCodeFirstDatabase.CreateAndInitializeDatabase();

            //The datamanger will handle locating and creating the XML files when the program ends.
            dataManager = new DataManager();

            //Populate the three collections (books, people, checkoutlogs)
            Books = new BookBLLCollection();
            Books.PopulateBooks();
            People = new PersonBLLCollection();
            People.PopulatePeople();
            Logs = new CheckOutLogBLLCollection();
            Logs.PopulateLogs();

            Main.Content = new StartingPage();
        }