public ActionResult Edit(Campaign campaign)
 {
     if (ModelState.IsValid)
     {
         db.Entry(campaign).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(campaign);
 }
        public ActionResult Create(Campaign campaign)
        {
            if (ModelState.IsValid)
            {
                db.Campaigns.Add(campaign);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(campaign);
        }