public ActionResult Create(DropFile dropfile)
        {
            if (ModelState.IsValid)
            {
                db.DropFiles.Add(dropfile);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(dropfile);
        }
 public ActionResult Edit(DropFile dropfile)
 {
     if (ModelState.IsValid)
     {
         db.Entry(dropfile).State = System.Data.EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(dropfile);
 }