public ActionResult Edit(Category c)
        {

            if (c==null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            if (c == null)
            {
                return HttpNotFound();
            }
           
            if (ModelState.IsValid)
            {
                Debug.WriteLine("id = " + c.catId);
                c.updateCategory(c);
            }
            else
            {
                Debug.WriteLine("id != ");
                return View(c);
            }
            return RedirectToAction("Details");
        }