private void BtnOK_Click(object sender, EventArgs e)
{
cfg.WriteString(SettingItems.baseUrl, txtBaseUrl.Text);
cfg.WriteString(SettingItems.appKey, txtAppKey.Text);
cfg.WriteString(SettingItems.appSecret, txtAppSecret.Text);
cfg.Save(SettingItems.settingFile);
DialogResult = DialogResult.OK;
Close();
}