public ActionResult Create(string firstName, string lastName)
        {
            if (String.IsNullOrEmpty(firstName) || String.IsNullOrEmpty(lastName))
            {
                throw new ArgumentOutOfRangeException();
            }

            var authorRepo = new AuthorRepository();
            var authorToAdd = new Author();

            authorToAdd.FirstName = firstName;
            authorToAdd.LastName = lastName;

            authorRepo.AddAuthor(authorToAdd);

            return RedirectToAction("Index");
        }