public ActionResult Edit(FeedbackViewModel feedbackViewModel)
 {
     if (ModelState.IsValid)
     {
         db.Entry(feedbackViewModel.Feedback).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(feedbackViewModel);
 }
 // GET: Feedbacks
 public ActionResult Index()
 {
     var feedBacks = db.Feedbacks.ToList();
     var feedBackModel = new FeedbackViewModel
     {
         Feedback = new Feedback(),
         Feedbacks = feedBacks
     };
     return View(feedBackModel);
 }