// GET: ContactList/Details/5
        public async Task <IActionResult> Details(int?id)
        {
            if (id == null)
            {
                return(NotFound());
            }

            var contactListEntry = await _service.GetByIdAsync(id.Value);

            if (contactListEntry == null)
            {
                return(NotFound());
            }

            return(View(contactListEntry));
        }