public ActionResult Create(PosterModel postermodel)
        {
            if (ModelState.IsValid)
            {

                //Server.HtmlEncode(postermodel.Text);
                postermodel.PostTime = DateTime.Now;
                postermodel.ModifyTime = DateTime.Now;
                postermodel.UserId = new UsersContext().UserProfiles.Single(u => u.UserName == User.Identity.Name).UserId;
                db.Posters.Add(postermodel);

                db.SaveChanges();
                //return RedirectToAction("Index");
                return RedirectToAction("Details/"+postermodel.Id);
            }

            //return View(postermodel);
            return RedirectToAction("Details/" + postermodel.Id);
        }
 public ActionResult Edit(PosterModel postermodel)
 {
     if (ModelState.IsValid)
     {
         db.Entry(postermodel).State = EntityState.Modified;
         postermodel.ModifyTime = DateTime.Now;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(postermodel);
 }