public ActionResult Category(Category obj)
 {
     DataManager db = new DataManager();
     Category old = db.GetCategory(obj.CategoryID);
     UpdateModel(old);
     db.Save();
     return RedirectToAction("List");
 }
 public ActionResult Category(Guid id)
 {
     DataManager db = new DataManager();
     return View(db.GetCategory(id));
 }