public ActionResult Create(Person person)
        {
            if (ModelState.IsValid)
            {
                person.Id = Guid.NewGuid();
                db.People.Add(person);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

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