used mvc3 for CRUD but how to do a search feature?

Hi...

Ive used http://www.c-sharpcorner.com/uploadfile/dhananjaycoder/crud-operation-in-Asp-Net-mvc-framework/ to create a database driven website for a rental company using the CRUD outlook...but now im looking to add a search feature and cant find any online....any help guys?

iv tried something like

 public ActionResult Search(int id)
        {
            return View();
        }

        [HttpPost]
        public ActionResult Search(Rental rentals)
        {
            try
            {
               
                _entities.//find record(rentals);
                _entities.SaveChanges();

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
Thanks