public ActionResult AboutDelete(int?id)
        {
            var about    = aboutManager.Find(x => x.Id == id);
            int isDelete = aboutManager.Delete(about);

            return(RedirectToAction("About"));
        }
        public ActionResult Details(int?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }
            About about = aboutManager.Find(x => x.Id == id.Value);

            if (about == null)
            {
                return(HttpNotFound());
            }
            return(View(about));
        }