private void Button_Click(object sender, RoutedEventArgs e)
        {
            Window3 list = new Window3();

            list.Show();
            this.Close();
        }
        private void Button_Click_1(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("You succesfully deleted" + " " + booklist.SelectedItem.ToString() + " " + "from your list!");
            Window2.booklst.Remove(booklist.SelectedItem.ToString());
            booklist.Items.Remove(booklist.SelectedItem);

            Window3 window3 = new Window3();

            window3.Show();
            this.Close();
        }