public ActionResult Create(Menu menu)
        {
            if (ModelState.IsValid)
            {
                menu.Id = Guid.NewGuid();
                db.Menus.Add(menu);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

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