public ActionResult Details(int id)
 {
     Telephone telephone = _repository.Get(id);
     var toDisplay = new TelephoneViewModel
                         {
                             Id = telephone.Id,
                             CustomerId = telephone.CustomerId,
                             PhoneNumber = telephone.PhoneNumber,
                             IsPrimary = telephone.IsPrimary,
                             ModifiedDate = telephone.ModifiedDate
                         };
     return toDisplay.Id > 0 ? View(toDisplay) : View("No data found");
 }
        public ActionResult Create(int customerId, Telephone telephone)
        {
            try
            {
                _repository.Add(customerId, telephone);
                var telephoneToDisplay = new TelephoneViewModel
                                             {
                                                 CustomerId = customerId,
                                                 Id = telephone.Id,
                                                 PhoneNumber = telephone.PhoneNumber,
                                                 IsPrimary = telephone.IsPrimary,
                                                 ModifiedDate = telephone.ModifiedDate
                                             };

                return RedirectToAction("Index", telephoneToDisplay);
            }
            catch
            {
                return View();
            }
        }
        public ActionResult Edit(int id)
        {
            Telephone telephone = _repository.Get(id);

            var custToDisplay = new TelephoneViewModel
                                    {
                                        Id = telephone.Id,
                                        CustomerId = telephone.CustomerId,
                                        PhoneNumber = telephone.PhoneNumber,
                                        IsPrimary = telephone.IsPrimary,
                                        ModifiedDate = telephone.ModifiedDate
                                    };
            return View(custToDisplay);
        }