public ActionResult CompleteOrder(int ID)
        {
            bool res;

            using (DBAgent.DBAgent agent = new DBAgent.DBAgent())
            {
                res = agent.CompleteOrder(ID);
            }
            if (res)
            {
                return(Redirect("/Home/Orders"));
            }
            else
            {
                return(View("~/Views/Shared/Error.cshtml"));
            }
        }