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        public static bool DirectoryExists(String Pfad,String User,String Pass)
        {
            try
            {
                FtpWebRequest request = (FtpWebRequest)WebRequest.Create(Pfad);
                request.Credentials = new NetworkCredential(User, Pass);
                request.Method = WebRequestMethods.Ftp.GetDateTimestamp;
                request.Timeout = 5000;
                request.UsePassive = true;

                FtpWebResponse response = (FtpWebResponse)request.GetResponse();
            }
            catch (WebException ex)
            {
                FtpWebResponse response = (FtpWebResponse)ex.Response;
                if (response.StatusCode == FtpStatusCode.ActionNotTakenFileUnavailable)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }

            return true;
        }