操作cookies值

                public const string cookies_Name = "e-biz"; 
                string GUI = System.Guid.NewGuid().ToString("N");
                HttpCookie MultiValueCookie = new HttpCookie(cookies_Name+user_name);
                MultiValueCookie.Values.Add(user_name, GUI);
                MultiValueCookie.Expires = DateTime.Now.AddDays(10);
                Response.Cookies.Add(MultiValueCookie);

           HttpCookie aCookie;
            string cookieName;
            int limit = Request.Cookies.Count;
            for (int i = 0; i < limit; i++)
            {
                cookieName = Request.Cookies[i].Name;
                aCookie = new HttpCookie(cookieName);
                aCookie.Expires = DateTime.Now.AddDays(-1);
                Response.Cookies.Add(aCookie);
            }

  HttpCookie MultiValueCookie = Request.Cookies[cookies_Name+user_name];     //cookies唯一标识，这里用了固定字符串加动态用户名
            if (MultiValueCookie != null)
            {
                foreach (string subkey in MultiValueCookie.Values.AllKeys)//循环读取cookies值
                {
                    string result = string.Empty;
                    result = MultiValueCookie.Values[user_name];
                   
                }
            }