private void receive_it_btn_Click(object sender, EventArgs e)
        {
            string  query;
            Boolean result;

            query  = "UPDATE lend_book SET recieve_case=1,delivery_date=NOW() WHERE id={0};";
            query  = string.Format(query, lend_book_id);
            result = DatabaseProcess.update(query);
            if (result)
            {
                MessageBox.Show("Kitap alındı");
                this.Close();
            }

            else
            {
                MessageBox.Show("Bir sorun oluştu");
            }
        }