I need create a one time. for one specific user. hear so many times created

[HttpPost]
       public ActionResult Create(other_source_income other_source_income)
       {
           if (ModelState.IsValid)
           {
               db.other_source_income.AddObject(other_source_income);
               db.SaveChanges();
               return RedirectToAction("Index");
           }

           return View(other_source_income);
       }