public ActionResult Create(VenueModel model)
        {
            if (ModelState.IsValid)
            {
                // Gotta do this first to get the identity column.
                model.UserId = User.Identity.Name;
                Db.Venues.Add(model);
                Db.SaveChanges();

                return RedirectToAction("Index");
            }

            return View(model);
        }
        public ActionResult Edit(VenueModel model)
        {
            if (
                !User.IsInRole("Admin")
                && model.UserId != User.Identity.Name
            )
            {
                return View("NotYourVenue");
            }

            if (ModelState.IsValid)
            {
                Db.Entry(model).State = EntityState.Modified;
                Db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(model);
        }