private void catalogueTabContentChangedEventHandler(object sender, RoutedEventArgs e)
{
if (titleTextBox.Text == "" && authorTextBox.Text == "" && publisherTextBox.Text == "" && selectedGenresList.Count == 0 && languageComboBox.SelectedIndex <= -1)
{
cashierCatalogue.ItemsSource = catalogue;
}
else
{
var title = titleTextBox.Text;
var author = authorTextBox.Text;
var publisher = publisherTextBox.Text;
var language = languageComboBox.SelectedItem == null ? "" : languageComboBox.SelectedItem.ToString();
var genres = selectedGenresListBox.Items;
cashierCatalogue.ItemsSource = new CatalogueViewList((List <Book>)bookChangeManager.bookBeingSearched(title, author, publisher, language, genres),
dao.CachedBookstores,
dao.CachedBookstoresOnBooksAvailability).list;
}
}