Session

                    //3.1用session保存用户的登录名
                    Session["UserName"] = name;

                    //3.3跳转回首页
                    Response.Redirect("/session/P03Index.aspx");

Session["UserName"].ToString()   //session的使用

    public class User
    {
        public string UserName { get; set; }
        public string Pwd { get; set; }
    }

                    User u = new session.User()
                    {
                        Pwd = pwd,
                        UserName = name
                    };
                    Session["User"] = u;