private void OnLoaded(object sender, RoutedEventArgs e)
        {
            Authors          = ApplicationDbContext.Instance.Authors.LoadAsObservableCollection();
            StoragePlaces    = ApplicationDbContext.Instance.StoragePlaces.LoadAsObservableCollection();
            PublishingHouses = ApplicationDbContext.Instance.PublishingHouses.LoadAsObservableCollection();
            SeriesList       = ApplicationDbContext.Instance.Series.LoadAsObservableCollection();
            Categories       = ApplicationDbContext.Instance.Categories.LoadAsObservableCollection();

            if (!BookView.Authors.IsNullOrEmpty())
            {
                ConfigureAuthorsComboBoxes();
            }

            if (!BookView.Categories.IsNullOrEmpty())
            {
                ConfigureCategoriesComboBox();
            }

            CategoriesCombobox.ItemsSource = EnumSorter.GetSortedByDescriptions <CategoryName>();
            LanguageComboBox.ItemsSource   = EnumSorter.GetSortedByDescriptions <Language>();
        }
 public CategoryAdding()
 {
     InitializeComponent();
     CategoryComboBox.ItemsSource = EnumSorter.GetSortedByDescriptions <CategoryName>();
 }