public void Update(AbonentViewModel abonent)
        {
            var entity = new Abonent();

            entity.AbonentID = abonent.HouseID;
            entity.FIO = abonent.FIO;
            entity.FlatNumber = abonent.FlatNumber;
            entity.Square = abonent.Square;
            entity.PhoneNumber = abonent.PhoneNumber;
            entity.HumansCount = abonent.HumansCount;
            entity.Deleted = abonent.Deleted;

            entity.StreetID = abonent.StreetID;


            if (abonent.Street != null)
            {
                entity.StreetID = abonent.StreetID;
            }

            entity.CityID = abonent.CityID;

            if (abonent.City != null)
            {
                entity.CityID = abonent.CityID;
            }

            entity.HouseID = abonent.HouseID;

            if (abonent.House != null)
            {
                entity.HouseID = abonent.HouseID;
            }

            abonent.AbonentID = entity.AbonentID;

            db.Abonents.Attach(entity);

            db.Entry(entity).State = EntityState.Modified;

           [color=red] db.SaveChanges();[/color]
         
         }

[AcceptVerbs(HttpVerbs.Post)]
        public ActionResult Update([DataSourceRequest] DataSourceRequest request,
            [Bind(Prefix = "models")] IEnumerable<AbonentViewModel> abonents)
        {
            IList<AbonentViewModel> abonentViewModels = abonents as IList<AbonentViewModel> ?? abonents.ToList();
            if (abonents != null && ModelState.IsValid)
            {
                foreach (AbonentViewModel abonent in abonentViewModels)
                {
                    abonentService.Update(abonent);
                }
            }



            return Json(abonentViewModels.ToDataSourceResult(request, ModelState));
        }

public class AbonentViewModel
    {
        //[ScaffoldColumn(false)]
        //[Key]
        public int AbonentID { get; set; }

        public string FIO { get; set; }

        public int FlatNumber { get; set; }

        public int Square { get; set; }

        public string PhoneNumber { get; set; }

        public int HumansCount { get; set; }

        public bool Deleted { get; set; }

        [UIHint("ClientStreetCascade")]
        public StreetViewModel Street { get; set; }
        public int StreetID { get; set; }
        public string StreetName { get; set; }
        [UIHint("ClientCityCascade")]
        public CityViewModel City { get; set; }
        public int CityID { get; set; }

        [UIHint("ClientHouseCascade")]
        public HouseViewModel House { get; set; }
        public int HouseID { get; set; }
        public string HouseFull { get; set; }
        public StreetTypeListViewModel StreetType { get; set; }
        public int? StreetTypeID { get; set; }
        public string StreetTypeName { get; set; }
    }