private void btnExitColumn_Click(object sender, EventArgs e)
        {
            BookInfoEditRows_UI b = new BookInfoEditRows_UI();

            b.Reader = this;
            b.ShowDialog();
        }
        private void button3_Click(object sender, EventArgs e)
        {
            BookInfoEditRows_UI b = new BookInfoEditRows_UI();

            b.Book = this;
            b.ShowDialog();
        }