asp.net实现Cookie保存值

//用Request获取到客户端Cookie  判断是否为空

  if (Request.Cookies["UserInfo"] == null)
            {
                //创建Cookie 并命名
                HttpCookie cookietwo = new HttpCookie("UserInfo");
             //   cookietwo.Name = "UserInfo";
                //Cookie为一年有效期
                cookietwo.Expires = DateTime.Today.AddDays(360);
                //设置Cookie对应键值
                cookietwo.Values["username"] = txtUserName.Text;
                cookietwo.Values["pwd"] = txtPassword.Text;
              //  CookieHelp.CookieHelper.AddCookie(cookietwo);
                // 用Response添加到Cookie中
                Response.Cookies.Add(cookietwo);
            }

//用Request获取到客户端Cookie  判断是否为空

  if (Request.Cookies["UserInfo"] != null)
            {

　　　　　　//读取Cookie 键值
                txtUserName.Text = Request.Cookies["UserInfo"]["username"].ToString();
                txtPassword.Text = Request.Cookies["UserInfo"]["pwd"].ToString();
            }