HTTPResponse挂在多个请求上

我有以下代码从HTTPServer下载一组文件。它给出了前几个文件的响应，后来卡在了响应中。我可以从我创建的日志文件中验证这一点。在日志文件中，它为第三个文件写“ webresponse之前”，但从未到达“ webresponse之后”。我已经在利用webresponse了。这里可能会发生什么？

            Logger.WriteToLog("url = " +url);
            // Create a request to the file we are downloading
            HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(url);
            webRequest.Timeout = 120000;
            webRequest.ReadWriteTimeout = 300000;

            // Set default authentication for retrieving the file
            //webRequest.Credentials = new NetworkCredential(GlobalVariables.username, GlobalVariables.password);
            webRequest.UseDefaultCredentials = true;

            // Retrieve the response from the server
            Logger.WriteToLog("Before webresponse");
            using (HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse())
            {
                Logger.WriteToLog("After webresponse");

                // Ask the server for the file size and store it
                //Int64 fileSize = webResponse.ContentLength;

                // Open the URL for download 
                using (Stream strResponse = webResponse.GetResponseStream())
                {
                    // Create a new file stream where we will be saving the data (local drive)
                    strLocal = File.Create(destFilePath);

                    // Loop through the buffer until the buffer is empty
                    while ((bytesSize = strResponse.Read(downBuffer, 0, downBuffer.Length)) > 0)
                    {
                        if (isPaused)
                            waitRun_m.WaitOne();

                        if (isCanceled)
                            break;

                        strLocal.Write(downBuffer, 0, bytesSize);
                        // Invoke the method that updates the form's label and progress bar
                        UpdateProgessCallback(mediaName, bytesSize);
                    };

                    strResponse.Close();
                }

            }