.net关于cookie的问题

Question

if ((Users)Session["currentUser"] != null)
            {
                this.lblUser.Text = "";
                this.imgbtnComplaint.Enabled = true;
                this.imgbtnLink.Enabled = true;
                user = (Users)Session["currentUser"];
                string userId = "xikemen"+user.UserId.ToString();
                if (Request.Cookies[userId] == null)
                {
                    HttpCookie cookieNew = new HttpCookie(userId);
                    cookieNew.Expires = DateTime.Now.AddDays(30);                    cookieNew.Values.Add("Clicked", "");
                    string ids = Request.QueryString["id"].ToString() + ",";
                    cookieNew.Values.Add("looked", ids);
                    //Response.AppendCookie(cookie);
                    //Response.SetCookie(cookie);
                    Response.Cookies.Add(cookieNew);
                }
                else
                {
                    HttpCookie cookieNew = Request.Cookies[userId];
                    if (cookieNew["looked"] == null)
                    {
                        string ids = Request.QueryString["id"].ToString() + ",";
                        cookieNew.Values.Add("looked", ids);
                    }
                    else
                    {
                        if (cookieNew["looked"].Contains(Request.QueryString["id"].ToString()))
                        {
                        }
                        else
                        {
                            cookieNew["looked"] += Request.QueryString["id"].ToString() + ",";
                        }
                    }
                  // Response.AppendCookie(cookie);
                    Response.Cookies.Add(cookieNew);
                    //Response.SetCookie(cookie);
                }
我写的这样一段代码 请问是不是哪里有问题？为什么cookie无法存储到客户端？