public IEnumerable Necro_overdueQuery()
{
 TombDataContext db = new TombDataContext();
            var query = from d in db.d_necro
                            join re in db.ReBook
                             on d.ano equals re.Fano into temp
                             from temp1 in temp.DefaultIfEmpty()
                             //where DateTime.Now.AddYears(-20) > d.buryday &&
                             //DateTime.Now.AddYears(-20) > re.bookDate
                             select new
                             {
                                 d.ano,d.fno,d.goname,d.goaddr,               
                                 temp1.bookId,
                                 temp1.bookDate,
                                 reremark = temp1.remark
                             };
                return query;
}