ASP.NET 支付宝问题 - .NET技术 / ASP.NET

protected void Page_Load(object sender, EventArgs e)
  {
  //string alipayNotifyURL = "https://www.alipay.com/cooperate/gateway.do?service=notify_verify";
  string alipayNotifyURL = "http://notify.alipay.com/trade/notify_query.do?";
  string partner = "2088101963067807"; //partner合作伙伴id（必须填写）
  string key = "u3l0sr7a6r5ofcm6uhp5m8lp7yb3uyz5"; //partner 的对应交易安全校验码（必须填写）
  string _input_charset = "utf-8";



  string buy_id = Convert.ToString(Session["fjk"]);
  // string buyname = AliPay.GetMD5(buy_id, "utf-8");
  //string mm = FormsAuthentication.HashPasswordForStoringInConfigFile(buy_id,"MD5");


  alipayNotifyURL = alipayNotifyURL + "&partner=" + partner + "&notify_id=" + Request.Form["notify_id"];
  //获取支付宝ATN返回结果，true是正确的订单信息，false 是无效的
  string responseTxt = Get_Http(alipayNotifyURL, 120000);
  int i;
  NameValueCollection coll;
  //Load Form variables into NameValueCollection variable.
  coll = Request.Form;

  // Get names of all forms into a string array.
  String[] request