public ActionResult Create(User user)
        {
            if (ModelState.IsValid)
            {
                db.Users.Add(user);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(user);
        }
 //
 // GET: /User/Create
 public ActionResult Create()
 {
     var model = new MvcWeb1.Models.User
     {
         UserName = @User.Identity.Name,
         DateUpdated = System.DateTime.Now
     };
     if (db.Users.Where(c => c.UserName.Equals(@User.Identity.Name)).Count() > 0 )
     {
         // Yoy can have only one identity
         @ViewBag.oneidentity = "You can have only one identity";
         return RedirectToAction("Index");
     }
     return View(model);
 }
 public ActionResult Edit(User user)
 {
     if (ModelState.IsValid)
     {
         db.Entry(user).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(user);
 }