Code
 FtpWebRequest request = (FtpWebRequest)WebRequest.Create(string.Format("{0}{1}", URL, node.ChildNodes[i].ChildNodes[0].InnerText)); 
                request.Method = WebRequestMethods.Ftp.DownloadFile; 
                request.Credentials = new NetworkCredential("wususu", "wususu"); 
                FtpWebResponse response = (FtpWebResponse)request.GetResponse(); 
                Stream responseStream = response.GetResponseStream(); 
                StreamReader red = new StreamReader(responseStream,Encoding.Unicode); 
                string tmp = red.ReadToEnd(); 
                byte[] mbyte = Encoding.Unicode.GetBytes(tmp);