public ActionResult Create(PersonFormViewModel viewModel)
        {
            //var gender = _context.Genders.Single(g => g.Id == viewModel.GenderId);

            if (!ModelState.IsValid)
            {
                viewModel.Genders = _context.Genders.ToList();
                return(View("Create", viewModel));
            }

            var contact = new Person
            {
                FirstName   = viewModel.FirstName,
                LastName    = viewModel.LastName,
                DateOfBirth = viewModel.GetDateOfBirth(),
                GenderId    = viewModel.GenderId
            };

            _context.Contacts.Add(contact);
            _context.SaveChanges();

            return(RedirectToAction("Index", "Home"));
        }