使用Httpwebrequest发送文件

hi我正试图使用webservice将xml文件从一个文件夹发送到本地计算机中的另一个文件夹，文件发送成功，应用程序正常关闭，但问题是文件在目标文件夹中会被永久修改，当我再次尝试调用Web服务时，会出现异常超时。这是我的代码

public void SendC_XML(string path, string queueID, string application, string servicewTMURI)
    {

        HttpWebRequest httpWebRequest2 = null;
        //Stream memStream = null;
        //FileStream fileStream = null;
        String[] listOfFiles = Directory.GetFiles(path, "*.xml");



        for (int i = 0; i < listOfFiles.Length; i++)
        {
            try
            {
                MyLog.Add("found path " + listOfFiles[i]);
                string[] ImagesArray = listOfFiles[i].Split('''');
                string ImageName = ImagesArray[ImagesArray.Length - 1];
                int index = ImageName.IndexOf(".");
                if (index > 0)
                    ImageName = ImageName.Substring(0, index);

                MyLog.Add("image name = " + ImageName);

                string[] textArray1 = new string[] { servicewTMURI, "/Queue/SetFile/", application, "/", queueID, "/" + ImageName + "/xml" };
                string requestUriString = string.Concat(textArray1);
                Guid guid = new Guid();
                string boundary = "---------------------------" + guid;

                httpWebRequest2 = (HttpWebRequest)WebRequest.Create(requestUriString);
                httpWebRequest2.ContentType = "multipart/form-data; boundary=" +
                boundary;
                MyLog.Add("ContentType = " + httpWebRequest2.ContentType);
                httpWebRequest2.Method = "POST";
                httpWebRequest2.KeepAlive = false;
                httpWebRequest2.Timeout = 5000;
                httpWebRequest2.Proxy = null;
                httpWebRequest2.ServicePoint.ConnectionLeaseTimeout = 5000;
                httpWebRequest2.ServicePoint.MaxIdleTime = 5000;
                httpWebRequest2.Credentials =
                System.Net.CredentialCache.DefaultCredentials;

                using (Stream memStream = new System.IO.MemoryStream())
                {

                    byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("'r'n--" +
                    boundary + "'r'n");

                    string formdataTemplate = "'r'n--" + boundary +
                    "'r'nContent-Disposition: form-data; name='"{0}'";'r'n'r'n{1}";



                    memStream.Write(boundarybytes, 0, boundarybytes.Length);
                    string headerTemplate = "Content-Disposition: form-data; name='"{0}'"; filename='"{1}'"'r'n Content-Type: application/octet-stream'r'n'r'n";
                    //for (int i = 0; i < files.Length; i++)
                    //{
                    //MyLog.Add("file = " + files[i]);
                    string header = string.Format(headerTemplate, "uplTheFile", listOfFiles[i]);
                    byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
                    memStream.Write(headerbytes, 0, headerbytes.Length);
                    using (FileStream fileStream = new FileStream(listOfFiles[i], FileMode.Open, FileAccess.Read))
                    {
                        byte[] buffer = new byte[1024];
                        int bytesRead = 0;
                        while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                        {
                            memStream.Write(buffer, 0, bytesRead);
                        }

                        memStream.Write(boundarybytes, 0, boundarybytes.Length);

                        fileStream.Close();
                    }
                    httpWebRequest2.ContentLength = memStream.Length;
                    using (Stream requestStream = httpWebRequest2.GetRequestStream())
                    {
                        memStream.Position = 0;
                        byte[] tempBuffer = new byte[memStream.Length];
                        memStream.Read(tempBuffer, 0, tempBuffer.Length);
                        memStream.Close();

                        requestStream.Write(tempBuffer, 0, tempBuffer.Length);
                        requestStream.Close();
                    }
                    //httpWebRequest2.Abort();
                    httpWebRequest2 = null;
                    //webResponse2 = null;
                }

            }
            catch (Exception ex)
            {
                MyLog.Add("error in cXML method = " + ex.Message);
            }
            finally
            {
                //memStream.Close();
                //fileStream.Close();
                //requestStream.Close();
                try
                {
                    if (httpWebRequest2 != null)
                    {
                        MyLog.Add("heeeeeeeeeeeeeeey request != null");
                        httpWebRequest2.GetRequestStream().Close();
                        httpWebRequest2 = null;
                    }
                }
                catch (Exception exception2)
                {
                    throw exception2;
                }
            }


        }
    }

public void Upload(string uri, string filePath)
{   
    string formdataTemplate = "Content-Disposition: form-data; filename='"{0}'";'r'nContent-Type: image/jpeg'r'n'r'n";
    string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
    byte[] boundarybytes = Encoding.ASCII.GetBytes("'r'n--" + boundary + "'r'n");
    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
    request.ServicePoint.Expect100Continue = false;
    request.Method = "POST";
    request.ContentType = "multipart/form-data; boundary=" + boundary;
    using(FileStream fileStream    = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
    {
        using (Stream requestStream = request.GetRequestStream())
        {
            requestStream.Write(boundarybytes, 0, boundarybytes.Length);
            string formitem = string.Format(formdataTemplate, Path.GetFileName(filePath));   
            byte[] formbytes = Encoding.UTF8.GetBytes(formitem);
            requestStream.Write(formbytes, 0, formbytes.Length);
            byte[] buffer = new byte[1024 * 4];
            int bytesLeft = 0;
            while ((bytesLeft = fileStream.Read(buffer, 0, buffer.Length)) > 0)
            {
                requestStream.Write(buffer, 0, bytesLeft);
            }
        }
    }
    try
    {           
        using (HttpWebResponse response    = (HttpWebResponse)request.GetResponse()) { }
        Console.WriteLine ("Success");
    }
    catch (Exception ex)
    {
        throw;
    }
}