public void PostCTHDP(Chitietdatphong ctdp)
 {
     using (QLKhachsanEntities entity = new QLKhachsanEntities())
     {
         entity.Chitietdatphongs.Add(ctdp);
         entity.SaveChanges();
     }
 }
        public void PutCTHDP(long sophong, long iddat, Chitietdatphong ctdp)
        {
            using (QLKhachsanEntities entity = new QLKhachsanEntities())
            {
                var cth = entity.Chitietdatphongs.FirstOrDefault(e => e.Sophong.Equals(sophong) && e.IDDAT.Equals(iddat));

                // cth.Sophong = cthdp.Sophong;
                // cth.IDHD = cthdp.IDHD;
                cth.Ngayden = ctdp.Ngayden;
                cth.Ngaydi  = ctdp.Ngaydi;
                entity.SaveChanges();
            }
        }