Paypal IPN侦听器c#错误。

我不熟悉asp.net webforms。 这是我的密码

字符串strSandbox=“”

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首先，请清除您的所有场景，并解释您的问题，即您在哪里会遇到错误。还解释了错误类型，如编译一次或运行时。在paypal网站上，IPN通知历史记录显示消息“重试”的状态。如果（strResponse==“VERIFIED”）{TestSave（）；}，则此代码块不运行

            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(strSandbox);
            //Set values for the request back
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            byte[] param = Request.BinaryRead(HttpContext.Current.Request.ContentLength);
            string strRequest = Encoding.ASCII.GetString(param);
            strRequest += "&cmd=_notify-  validate";
            req.ContentLength = strRequest.Length;

            StreamWriter streamOut = new StreamWriter(req.GetRequestStream(), System.Text.Encoding.ASCII);
            streamOut.Write(strRequest);
            streamOut.Close();
            StreamReader streamIn = new StreamReader(req.GetResponse().GetResponseStream());
            string strResponse = streamIn.ReadToEnd();
            streamIn.Close();
            if (strResponse == "VERIFIED")
            {   
               TestSave();           
             }
            else if (strResponse == "INVALID")
            {               }
            else
            {               }