public static IEnumerable <UserPermissionModel> SelectUserPermissionByPage(int page, int pageSize)
        {
            var dt = DALUserPermission.SelectUserPermissionByPage(page, pageSize);

            if (dt == null || dt.Rows.Count <= 0)
            {
                return(new UserPermissionModel[0]);
            }
            return(dt.Rows.Cast <DataRow>().Select(row => new UserPermissionModel(row)));
        }