private void cancelRegButton_Click(object sender, EventArgs e) { if (howtocancel == -1) { MessageBox.Show("系统异常,在未查找到信息的情况下不能删除"); } else if (howtocancel == 1) { string updateReg = "UPDATE `regandduty` set `ifUse`='0', `paiID`='' WHERE `regID`='" + regID.Text + "'"; if (sql.update(updateReg) == 1) { MessageBox.Show("退号成功"); clear(); clearReg(); } } else if (howtocancel == 0) { string delquery = "DELETE FROM `addReg` WHERE `RegID`='" + regID.Text + "'"; if (sql.del(delquery)) { MessageBox.Show("退号成功"); clearReg(); clear(); } } }