程序是微信公众号模板消息发送，进度条显示进度。
for (int i = 0; i < arrl; i++)
{
//省略部分代码没贴出
string result = GetResponseJsonData(allsenddata, url); 向微信服务器发送内容

this.context.Application["progresslsdm"] = i;
Thread.Sleep(2000);
}

当没有GetResponseJsonData(allsenddata, url);这行时，程序正常显示进度条进度，但加了这段发布消息的程序后，Thread.Sleep(2000)就没执行，整个循环一下子就结束了，没有执行Thread.Sleep，消息也正常发送到微信服务器，但是进度条无效了。

public static string GetResponseJsonData(string JSONData, string Url)
        {
            string strResult = "";
            HttpWebRequest request = null;
            HttpWebResponse response = null;
            Stream reqstream = null;

            try
            {
                byte[] bytes = Encoding.UTF8.GetBytes(JSONData);
                ServicePointManager.ServerCertificateValidationCallback = delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
                request = (HttpWebRequest)WebRequest.Create(Url);
                request.Method = "POST";
                request.ContentLength = bytes.Length;
                request.ContentType = "application/json";
                reqstream = request.GetRequestStream();
                reqstream.Write(bytes, 0, bytes.Length);
                reqstream.Close();

                //声明一个HttpWebRequest请求  
                request.Timeout = 90000;
                //设置连接超时时间  
                request.Headers.Set("Pragma", "no-cache");
                response = (HttpWebResponse)request.GetResponse();
                Stream streamReceive = response.GetResponseStream();
                Encoding encoding = Encoding.UTF8;

                StreamReader streamReader = new StreamReader(streamReceive, encoding);
                strResult = streamReader.ReadToEnd();
                streamReader.Close();
                streamReceive.Dispose();
                streamReader.Dispose();
            }
            catch (Exception e)
            {
            }
            finally
            {
                //关闭连接和流
                if (response != null)
                {
                    response.Close();
                }
                if (request != null)
                {
                    request.Abort();
                }
            }

            return strResult;
        }


请各位大神帮忙找找原因。