public ActionResult Edit(Donor donor)
 {
     if (ModelState.IsValid)
     {
         Db.Entry(donor).State = EntityState.Modified;
         Db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(donor);
 }
        public ActionResult Create(Donor donor)
        {
            if (ModelState.IsValid)
            {
                Db.Donors.Add(donor);
                Db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(donor);
        }