private async void NavigationHelper_LoadState(object sender, LoadStateEventArgs e) { int Id = (int)e.NavigationParameter; var Item = await RestaurantPageSource.GetRestaurantAsync(Id); this.ProgressRing.IsActive = false; if (Item == null) { if (Frame.CanGoBack) { Frame.GoBack(); await ShowErrorAsync(); } else { if (!Frame.Navigate(typeof(MainPage), "FoodLook 2")) { throw new Exception(); } Frame.BackStack.Clear(); await ShowErrorAsync(); } } else { this.DefaultViewModel[Restaurant] = Item; this.DefaultViewModel[Label] = Item.Label; LikeButtonToggle(); FavoriteButtonToggle(); this.RestaurantPageCommandBar.Visibility = Visibility.Visible; if (Item.Website == null) { this.WebsiteBlock.Visibility = Visibility.Collapsed; } if (Item.Email == null) { this.EmailBlock.Visibility = Visibility.Collapsed; } if (Item.Facebook == null) { this.FacebookBlock.Visibility = Visibility.Collapsed; } if (Item.Instagram == null) { this.InstagramBlock.Visibility = Visibility.Collapsed; } if (!Item.Parking) { this.ParkingImage.Opacity = 0.4; } if (!Item.PaymentCards) { this.PaymentCardsImage.Opacity = 0.4; } if (!Item.LiveMusic) { this.LiveMusicImage.Opacity = 0.4; } if (Item.Telephone == null) { this.PhoneButton.Visibility = Visibility.Collapsed; } this.RestaurantPagePivot.Visibility = Visibility.Visible; } }