private void btn_new_Click(object sender, EventArgs e)
        {
            p_PayrollRegisterEntry frm = new p_PayrollRegisterEntry(this, "", true);

            frm.ShowDialog();
            disp_list();
        }
        private void btn_upd_Click(object sender, EventArgs e)
        {
            int    r = 0;
            String code;

            if (dgv_list.Rows.Count > 1)
            {
                r    = dgv_list.CurrentRow.Index;
                code = dgv_list["dgvl_payrollreg_code", r].Value.ToString();
                p_PayrollRegisterEntry frm = new p_PayrollRegisterEntry(this, code, false);
                frm.ShowDialog();
                disp_list();
            }
            else
            {
                MessageBox.Show("No records to be selected.");
            }
        }