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                FtpWebRequest req = (FtpWebRequest)WebRequest.Create(url);
                req.Method = WebRequestMethods.Ftp.DownloadFile;
                req.Credentials = new NetworkCredential(username, password);
                req.UseBinary = true;

                //stellt uri-Antwort bereit
                using (WebResponse resp = req.GetResponse())
                {
                    using (Stream respStream = resp.GetResponseStream())
                    {
                        Byte[] buffer = new Byte[4096];
                        int count;
                        using (FileStream f = new FileStream(filename, FileMode.Append))
                        {
                            do
                            {
                                count = respStream.Read(buffer, 0, buffer.Length);
                                if (count > 0)
                                {
                                    f.Write(buffer, 0, count);
                                }
                            }
                            while (count > 0);
                        }
                    }
                }