create subfolders in ftp server

private static bool CreateFTPDirectory(string directory, string folders)
        {

            bool exito = true;

            string[] lstfolders = folders.Split('/');

            string pathftp = directory;
            foreach (string fol in lstfolders)
            {

                if (fol != "")
                {

                    try
                    {
                        pathftp += "/" + fol;
                        //create the directory
                        FtpWebRequest requestDir = (FtpWebRequest)FtpWebRequest.Create(new Uri(pathftp));
                        requestDir.Method = WebRequestMethods.Ftp.MakeDirectory;
                        requestDir.Credentials = new NetworkCredential("ftpbienesraices", "b13n3sr@1c3s");
                        requestDir.UsePassive = true;
                        requestDir.UseBinary = true;
                        requestDir.KeepAlive = false;
                        FtpWebResponse response = (FtpWebResponse)requestDir.GetResponse();
                        Stream ftpStream = response.GetResponseStream();

                        ftpStream.Close();
                        response.Close();
                    }
                    catch (WebException ex)
                    {
                        FtpWebResponse response = (FtpWebResponse)ex.Response;
                        if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
                        {
                            response.Close();
                            exito = true;
                        }
                        else
                        {
                            response.Close();
                            exito = false;
                        }
                    }
                }
            }

            return exito;

        }