var dd = dx.Tables[0].AsEnumerable().Select(x => new StaffModel
                    {
                        userno = x.Field<string>("USERNO"),
                        dateofbirth = x.Field<DateTime>("DATEOFBIRTH"), // This comes as a DB NULL.
                        passportno = x.Field<String>("PASSPORTNO"),
                        passportexp = x.Field<DateTime>("EXPDATE")

                    });