private void AddButton_Click(object sender, EventArgs e)
        {
            EUSiteSetting   siteSetting     = new EUSiteSetting();
            SiteSettingForm siteSettingForm = new SiteSettingForm();

            siteSettingForm.InitializeForm(siteSetting);
            if (siteSettingForm.ShowDialog() == DialogResult.OK)
            {
                Settings.SiteSettings.Add(siteSetting);
                LoadSites();
            }
        }
        private void SitesListBox_DoubleClick(object sender, EventArgs e)
        {
            if (SitesListBox.SelectedItem == null)
            {
                return;
            }
            EUSiteSetting   siteSetting     = (EUSiteSetting)SitesListBox.SelectedItem;
            SiteSettingForm siteSettingForm = new SiteSettingForm();

            siteSettingForm.InitializeForm(siteSetting);
            if (siteSettingForm.ShowDialog() == DialogResult.OK)
            {
                LoadSites();
            }
        }