public ActionResult Edit(TenantShowing tenantshowing)
 {
     if (ModelState.IsValid)
     {
         db.Entry(tenantshowing).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(tenantshowing);
 }
        public ActionResult Create(TenantShowing tenantshowing)
        {
            if (ModelState.IsValid)
            {
                db.TenantShowings.Add(tenantshowing);
                db.SaveChanges();
                return RedirectToAction("Index");  
            }

            return View(tenantshowing);
        }