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            string filename = "C:/SpaceUnix.txt";
            string username = "xyz";
            string password = "abc";
            string URI = "ftp://servername/Space_Unix.txt";

            NetworkCredential nc = new NetworkCredential(username, password);
            WebRequest req = WebRequest.Create(URI);
            req.Credentials = nc;
            WebResponse resp = req.GetResponse();
            using (FileStream fsb = new FileStream(filename, FileMode.CreateNew))
            {
                BinaryWriter bw = new BinaryWriter(fsb);
                Byte[] read = new Byte[1024];
                int bytes = resp.GetResponseStream().Read(read, 0, 1024);
            }					

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  var url := 'ftp://www.eine-domain.de/eineDatei.txt';
  var req := FtpWebRequest(WebRequest.Create(url));
  req.Method := WebRequestMethods.Ftp.DownloadFile;
  req.Credentials := new NetworkCredential(aUsername, aPassword);
  req.UseBinary := true;
    
  using resp := req.GetResponse do
    using respStream := resp.GetResponseStream do
    begin      
      var buffer := new Byte[2048];
      var count : Integer;
      using f := File.Create('e:\eineDatei.txt') do
        repeat
          count := respStream.Read(buffer, 0, buffer.Length);
          if count > 0 then
            f.Write(buffer, 0, count); 
        until count = 0;    
    end;					

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string url = "ftp://www.eine-domain.de/eineDatei.txt";
FtpWebRequest req = (FtpWebRequest) WebRequest.Create(url);
req.Method = WebRequestMethods.Ftp.DownloadFile;
req.Credentials = new NetworkCredential(aUsername, aPassword);
req.UseBinary = true;
    
using (WebResponse resp = req.GetResponse) //hier bin ich mir bei "WebResponse" nicht sicher, bitte in der Doku nachschlagen
{
  using (Stream respStream = resp.GetResponseStream)
  {   
    Byte[] buffer = new Byte[2048];
    int count;
    using (FileStream f : File.Create(@"e:\eineDatei.txt"))
    {
      do {
        count = respStream.Read(buffer, 0, buffer.Length);
        if (count > 0)
          f.Write(buffer, 0, count);
      } while (count > 0);
   }
}