void FtpSettingButton_Click(object sender, RoutedEventArgs e)
        {
            var ftpsetting = new FTPWindow(_ftp);

            bool?ok = ftpsetting.ShowDialog();

            if (ok != null && ok == true)
            {
                _ftp = ftpsetting.Ftp;
            }
        }
        void FtpSettingButton_Click(object sender, RoutedEventArgs e)
        {
            var ftpsetting = new FTPWindow(_ftp);

            bool? ok = ftpsetting.ShowDialog();
            if (ok != null && ok == true)
            {
                _ftp = ftpsetting.Ftp;
            }
        }