FtpWebRequest Double Login?

public static FtpWebRequest request = null;

public static bool Login()
        {
            try
            {
                request = (FtpWebRequest) WebRequest.Create(new Uri(_uri));
                request.Credentials = new NetworkCredential(_userName, _password);
                request.Method = WebRequestMethods.Ftp.ListDirectory;
                request.UseBinary = _useBinary;
                request.EnableSsl = _enableSsl;
                request.KeepAlive = _keepAlive;
                request.UsePassive = _usePassive;
                request.Timeout = _timeOut;

                using (var response = (FtpWebResponse) request.GetResponse())
                {
                    statusMessage(response.StatusDescription);
                }
                
                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }

        public static void Upload()
        {
            if (Login())
            {
                try
                {
                    request = (FtpWebRequest) WebRequest.Create(_uri + _fileName);
                    request.Method = WebRequestMethods.Ftp.UploadFile;
                    request.Credentials = new NetworkCredential(_userName, _password);

                    using (var sourceStream = new StreamReader(_filePath + _fileName))
                    {
                        byte[] fileContents = Encoding.UTF8.GetBytes(sourceStream.ReadToEnd()); 
                        request.ContentLength = fileContents.Length;

                        using (Stream requestStream = request.GetRequestStream())
                        {
                            requestStream.Write(fileContents, 0, fileContents.Length);
                        }
                    }

                    using (var response = (FtpWebResponse) request.GetResponse())
                    {
                        statusMessage(response.StatusDescription);
                    }
                }
                catch (Exception ex)
                {
                    statusMessage(ex.Message);
                }
            }
        }

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