ASP.Net MVC set/get cookie

CookieTestController.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Microsoft.Ajax.Utilities;
using Newtonsoft.Json;

namespace cookies.Controllers
{
    public class CookieTestController : Controller
    {
        private StuffRepository _stuffRepository;

        public CookieTestController()
        {
            _stuffRepository = new StuffRepository();
        }

        public ActionResult Index()
        {
            var stuff = _stuffRepository.GetStuff();
            if (stuff != null)
            {
                var json = JsonConvert.SerializeObject(stuff);

                var stuffCookie = new HttpCookie("stuff", json);
                stuffCookie.Expires.AddDays(365);
                HttpContext.Response.SetCookie(stuffCookie);
            }

            return View();
        }

        public ActionResult GetCookie()
        {
            if (HttpContext.Request.Cookies["stuff"] != null)
            {
                var stuffCookie = Request.Cookies["stuff"].Value;
                var stuff = JsonConvert.DeserializeObject<Stuff>(stuffCookie);
                return View(stuff);
            }

            throw new Exception("Could not retrieve cookie");
        }
    }

    public class StuffRepository
    {
        public Stuff GetStuff()
        {
            var stuff = new Stuff()
            {
                Description = "This is stuff",
                Age = 666
            };

            return stuff;
        }
    }

    public class Stuff
    {
        public string Description { get; set; }
        public int Age { get; set; }
    }
}