private void AddAnimalToZoo_Clicked(object sender, RoutedEventArgs e) { if (listBoxZoo.SelectedItem != null && listBoxAllAnimals.SelectedItem != null) { try { DbConnectionManager.AddAnimalToZoo(listBoxZoo, listBoxAllAnimals); } catch (Exception ex) { MessageBox.Show(ex.ToString()); } finally { ShowAnimalsList(); } } else { MessageBox.Show("Please select a zoo and animal first"); } }