Public void upload ()
{

  String sourcefilepath ="C:\Users\TST\Desktop\TESTOWS.txt";
  String ftpurl = "1.1.1.1/LIBRARY";
  String ftpusername = "ACC";
  String ftppassword = "ACC";
  Stream requestStream = null;

  FileStream fileStream = null;
  FtpWebResponse uploadResponse = null;

  try
  {
    string filename = Path.GetFileName(sourcefilepath);
    string ftpfullpath = @"ftp://" + ftpurl + "/" + filename;
    FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(string.Format(ftpfullpath));
    uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;

    //Since the FTP you are downloading to is secure, send
    //in user name and password to be able upload the file

    ICredentials credentials = new NetworkCredential(ftpusername, ftppassword);

    uploadRequest.Credentials = credentials;
    uploadRequest.UsePassive = true;
    uploadRequest.UseBinary = false;
    uploadRequest.KeepAlive = false;

    //UploadFile is not supported through an Http proxy
    //so we disable the proxy for this request.

    uploadRequest.Proxy = null;
    //uploadRequest.UsePassive = false; <--found from another forum and did not make a difference

    requestStream = uploadRequest.GetRequestStream();
    fileStream = File.Open(sourcefilepath, FileMode.Open);

    byte[] buffer = new byte[1024];
    int bytesRead;

    while (true)
    {
      bytesRead = fileStream.Read(buffer, 0, buffer.Length);
      if (bytesRead == 0)
       break;

      requestStream.Write(buffer, 0, bytesRead);
    }

    //The request stream must be closed before getting
    //the response.

    requestStream.Close();
    uploadResponse = (FtpWebResponse)uploadRequest.GetResponse();
  }
  catch (UriFormatException ex)
  {
    MessageBox.Show(ex.Message);
  }
  catch (IOException ex)
  {
    MessageBox.Show(ex.Message);
  }
  catch (WebException ex)
  {
    MessageBox.Show(ex.Message);
  }
  finally
  {
    if (uploadResponse != null)
      uploadResponse.Close();

    if (fileStream != null)
      fileStream.Close();

    if (requestStream != null)
      requestStream.Close();
  }
}