private void gv2_DriverSelected_DoubleClick(object sender, EventArgs e)
        {
            //1.删除缓存记录（未保存到数据库的）
            DataTable dt = gv2_DriverSelected.GridControl.DataSource as DataTable;
            dt.Rows.Remove(gv2_DriverSelected.GetFocusedDataRow());

            //2.删除数据库的记录
            var key = gv2_DriverSelected.GetFocusedDataRow()["记录主键"];
            new dalOrder().Delete(key);//从数据库删除
        }