public void createDirectory(string newDirectory)
        {
            try
            {
                WebRequest req;

                WebProxy proxy = Proxy;
                proxy.Credentials = new NetworkCredential(@"domain\userLogin", "password"); // прокси авторизация
                req = WebRequest.Create(host + "/" + newDirectory);
                req.Proxy = proxy;
                
                ftpRequest = (FtpWebRequest)req;
                ftpRequest.Credentials = new NetworkCredential(user, pass); // ftp авторизация
                ftpRequest.UseBinary = true;
                ftpRequest.UsePassive = true;
                ftpRequest.KeepAlive = true;

                ftpRequest.Method = WebRequestMethods.Ftp.MakeDirectory;

                ftpResponse = (FtpWebResponse)ftpRequest.GetResponse(); //*ОШИБКА

                ftpResponse.Close();
                ftpRequest = null;
            }
            catch (Exception ex) {  }
            return;
        }