public bool postChiTietMatHang(CHITIETMATHANG a)
 {
     try
     {
         db.CHITIETMATHANGs.Add(a);
         db.SaveChanges();
         return(true);
     }
     catch (Exception e)
     {
         throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.BadRequest, false));
     }
 }
        public bool put_CTMH(CHITIETMATHANG a)
        {
            try
            {
                var b = db.CHITIETMATHANGs.Where(c => c.ID.Equals(a.ID)).FirstOrDefault();
                b.IDMatHang = a.IDMatHang;
                b.Loai      = a.Loai;
                b.MauSac    = a.MauSac;
                b.Gia       = a.Gia;
                b.Size      = a.Size;
                b.SoLuong   = a.SoLuong;
                b.STATUS    = a.STATUS;

                db.SaveChanges();
                return(true);
            }
            catch (Exception e)
            {
                throw new HttpResponseException(Request.CreateResponse(HttpStatusCode.BadRequest, false));
            }
        }