private void Button_Click(object sender, RoutedEventArgs e)
        {
            switch (((Button)sender).Name)
            {
            case "addButton":
                _presenter.AddAuthor();
                break;

            case "editButton":
                _presenter.EditAuthor();
                break;

            case "deleteButton":
                _presenter.DeleteAuthor();
                break;

            default:
                break;
            }
        }