public ActionResult Create(Grado grado)
        {
            try
            {
                contexto.Grados.InsertOnSubmit(grado);
                contexto.SubmitChanges();
                // TODO: Add insert logic here

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }
 partial void DeleteGrado(Grado instance);
 partial void UpdateGrado(Grado instance);
 partial void InsertGrado(Grado instance);