static NetworkHelper()
{
instance = new NetworkHelper();
}
/// <summary>
/// 显示网络状态
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void networkHelp_NetworkStatusChanged(object sender, NetworkHelper.NetworkChangedEventArgs e)
{
if (e.IsNetworkAlive)
labNetStatus.Text = "网络状态正常";
else
labNetStatus.Text = "网络连接失败";
}