DotNetClubs

 Prueba con algo del estilo:

public void upload()
        {
                try
                {
                    FtpWebRequest dirFtp =
                        ((FtpWebRequest)FtpWebRequest.Create(this._servidorPath));

                    NetworkCredential cr =
                        new NetworkCredential(this._usuari, this._password);
                    dirFtp.Credentials = cr;

                    dirFtp.Method = WebRequestMethods.Ftp.UploadFile;

                    System.IO.Stream stream = dirFtp.GetRequestStream();
                    stream.Write(this.Imagen, 0, this.Imagen.Length);

                    stream.Close();

                    FtpWebResponse ftpResponse = (FtpWebResponse)dirFtp.GetResponse();

                    ftpResponse.Close();
                }
                catch (Exception ex)
                {
                    System.Exception nEx = new Exception("ERROR (FTPFile:upload)"
                        + Environment.NewLine + ex.Message);
                    throw (nEx);
                }
            }
            else
            {
                System.Exception nEx = new Exception("ERROR (FTPFile:upload)"
                    + Environment.NewLine + "Sense Contingut");
                throw (nEx);
            }
        }
 

 Lo subo "char a char"...