public void EditAuthor()
        {
            Author           oldAuthor = new Author(_view.GetSelecetedAuthor().FirstName, _view.GetSelecetedAuthor().LastName);
            additionalWindow window    = new additionalWindow(_view.GetSelecetedAuthor());
            bool?            res       = window.ShowDialog();

            if (res != null && res == true)
            {
                _model.EditAuthor(oldAuthor, window.Author);
            }
            _view.MyListView.ItemsSource = _model.GetList();
        }
        public void AddAuthor()
        {
            additionalWindow window = new additionalWindow();
            bool?            res    = window.ShowDialog();

            if (res != null && res == true)
            {
                Author author = window.Author;
                _model.AddAuthor(author);
            }
            _view.MyListView.ItemsSource = _model.GetList();
        }