public ActionResult Edit(int id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }

            var buss    = new StudentBusiness();
            var student = new StudentViewModel();

            student = buss.FindIdStd(id);

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