private void saveEntry(object sender, EventArgs e)
        {
            if (titleTextBox.Text.Length > 0)
            {
                VideoGame newGame = new VideoGame
                {
                    Title = titleTextBox.Text,
                    Console = consoleTextBox.Text,
                    Notes = notesTextBox.Text,
                    Own = (ownCheckBox.IsChecked.HasValue ? ownCheckBox.IsChecked.Value : false),
                    PurchaseDate = purchaseDatePicker.Value,
                    PurchasePrice = purchasePriceTextBox.Text,
                    PurchasePlace = purchasePlaceTextBox.Text,
                    SellDate = sellDatePicker.Value,
                    SellPrice = sellPriceTextBox.Text,
                    SellPlace = sellPlaceTextBox.Text,
                    AddOn = addOnCheckBox.IsChecked.HasValue ? addOnCheckBox.IsChecked.Value : false,
                    Electronic = electronicCheckBox.IsChecked.HasValue ? electronicCheckBox.IsChecked.Value : false,
                    Used = usedCheckBox.IsChecked.HasValue ? usedCheckBox.IsChecked.Value : false,
                    Beat = beatCheckBox.IsChecked.HasValue ? beatCheckBox.IsChecked.Value : false
                };

                App.ViewModel.AddVideoGame(newGame);

                if (NavigationService.CanGoBack)
                {
                    NavigationService.GoBack();
                }
            }
        }
        public void AddVideoGame(VideoGame newGame)
        {
            db.VideoGames.InsertOnSubmit(newGame);
            db.SubmitChanges();

            AllVideoGames.Insert(0, newGame);
            VideoGamesByTitle = new ObservableCollection<VideoGame>(AllVideoGames.OrderBy(v => v.Title).ThenBy(v => v.Console));
            UpdateCollections();
        }
        public void DeleteVideoGame(VideoGame game)
        {
            db.VideoGames.DeleteOnSubmit(game);
            db.SubmitChanges();

            AllVideoGames.Remove(game);
            VideoGamesByTitle.Remove(game);
            UpdateCollections();
        }