FTP SSL using .NET 4.0

public static void Download(string fileName)
        {
            FtpWebRequest reqFTP;
            FileStream outputStream = null;
            Stream ftpStream = null;
            FtpWebResponse response = null;
            //FtpWebRequest.RegisterPrefix("ftps://",System.Net.FtpWebRequest.Create(""));
           
            try
            {
                //filePath = <<The full path where the
                //file is to be created. the>>,
                //fileName = <<Name of the file to be createdNeed not
                //name on FTP server. name name()>>
                outputStream = new FileStream(Constants.TempFilePath +
                                        @"\" + fileName, FileMode.Create);

               
                reqFTP = (FtpWebRequest)FtpWebRequest.Create(new Uri("ftps://" +
                                        Constants.FtpServerIP + "/" + fileName));

                MessageLogger.LogMessage("FTPS Path created for each file: " + reqFTP, InformationType.Information);
                reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
                reqFTP.UseBinary = true;
                reqFTP.EnableSsl = true;
                reqFTP.Credentials = new NetworkCredential(Constants.FtpUserID, Constants.FtpPassword);
                response = (FtpWebResponse)reqFTP.GetResponse();
                ftpStream = response.GetResponseStream();
                long cl = response.ContentLength;
                int bufferSize = 2048;
                int readCount;
                byte[] buffer = new byte[bufferSize];

                readCount = ftpStream.Read(buffer, 0, bufferSize);
                while (readCount > 0)
                {
                    outputStream.Write(buffer, 0, readCount);
                    readCount = ftpStream.Read(buffer, 0, bufferSize);
                }               
            }