1. http Cookies赋值:

                 HttpCookie cookies;
            cookies = new HttpCookie("Fanfenghua");
            cookies.Values.Add("Name", "Fanfenghua"); //添加值
            cookies.Values.Add("Age", "30");
            cookies["Sex"] = "Man";  //另一种赋值模式
            DateTime dt = DateTime.Now.AddHours(20);
            cookies.Expires = dt;  //失效时间
            Response.AppendCookie(cookies);

2. http cookies取值 :

string name="";
            string age="";
            HttpCookie cookies = Request.Cookies["Fanfenghua"];
            if (cookies != null)
            {
                 name = cookies["Name"];
                 age = cookies["Age"];
            }

            Label1.Text = name;
            Label2.Text = age;

3.删除Cookie:

  HttpCookie cookie = Request.Cookies["Fanfenghua"];

            if (cookie != null)
            {
                DateTime dt = DateTime.Now.AddDays(-1);
                cookie.Expires = dt;
                Response.AppendCookie(cookie);
            }