private void DeleteAnimal_Clicked(object sender, RoutedEventArgs e)
 {
     if (listBoxAllAnimals.SelectedItem != null)
     {
         try
         {
             DbConnectionManager.DeleteAnimal(listBoxAllAnimals);
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.ToString());
         }
         finally
         {
             ShowAllAnimals();
             textAnimal.Text = "";
         }
     }
     else
     {
         MessageBox.Show("Please select animal to delete");
     }
 }