如何在远程服务器上写入CSV文件

我正试图将一些输出写入服务器上的.csv文件。我使用了以下代码，但文件中仍然没有输出。意味着什么都没写。我的代码在这里

void WriteInRegister(DataRow userdata)
        {
            HttpWebRequest reqHTTP;
            StringBuilder result = new StringBuilder();
            try
            {
                reqHTTP = (HttpWebRequest)HttpWebRequest.Create(new Uri("http://10.10.10.10/config/RequestPlacer.csv"));
                reqHTTP.Credentials = new NetworkCredential("usename", "password");
                if (reqHTTP != null)
                {
                    reqHTTP.ContentType = "application/octet-stream";
                    reqHTTP.Method = WebRequestMethods.File.UploadFile;
                }
                string postdata = (userdata[0].ToString() + ",MacId," + DateTime.Now.ToShortDateString()).ToString();
                byte[] text = Encoding.UTF8.GetBytes(postdata);
                reqHTTP.ContentLength = text.Length;
              /* WebClient wcClient = new WebClient();
                wcClient.Credentials = new NetworkCredential("usename", "password");
                wcClient.UseDefaultCredentials = true;*/
                //wcClient.OpenWrite(new Uri("http://10.10.10.10/config/RequestPlacer.csv"), postdata);

                //  string path = System.Web.HttpContext.Current.Server.MapPath("http://10.10.10.10/config/RequestPlacer.csv");
                   reqHTTP.AllowWriteStreamBuffering = true;
                   Stream writer = reqHTTP.GetRequestStream();
                  /* wcClient.Headers.Add("Content-Type", "application/csv");
                   wcClient.UploadString(new Uri("http://10.10.10.10/config/RequestPlacer.csv"), "POST", postdata);*/

                StreamWriter streamwriter = new StreamWriter(writer);
                streamwriter.WriteLine(postdata);
                streamwriter.Close();
            }
            catch (Exception exe)
            {
                MessageBox.Show(exe.Message);
            }
        }

异常为（"请求已中止：请求已取消。"）