public ActionResult Edit(Ad advert)
 {
     using (CommonContext db = new CommonContext())
     {
         Ad ad = db.Ads.Find(advert.Id);
         ad.Title = advert.Title;
         ad.Text = advert.Text;
         ad.Keywords = advert.Keywords;
         ad.Theme = advert.Theme;
         ad.Date = DateTime.Now;
         ad.Country = advert.Country;
         db.SaveChanges();
     }
     return RedirectToAction("Index");
 }
        public ActionResult New(Ad advert)
        {
            using (CommonContext db = new CommonContext()) 
            {
                advert.Date = DateTime.Now;
                advert.Engaged = 0;
                advert.Views = 0;
                advert.Theme = advert.Theme;
                advert.OwnerID = User.Identity.Name;
                advert.Country = advert.Country;

                db.Ads.Add(advert);
                db.SaveChanges();
            }            
            return RedirectToAction("Index");
        }