public ActionResult Edit(Comment comment)
 {
     if (ModelState.IsValid)
     {
         context.Entry(comment).State = EntityState.Modified;
         context.SaveChanges();
         return RedirectToAction("Index");
     }
     ViewBag.PossiblePosts = context.Posts;
     return View(comment);
 }
        public ActionResult Create(Comment comment)
        {
            if (ModelState.IsValid)
            {
                context.Comments.Add(comment);
                context.SaveChanges();
                return RedirectToAction("Index");  
            }

            ViewBag.PossiblePosts = context.Posts;
            return View(comment);
        }