用c#监控网络状态

using  Microsoft.VisualBasic.Devices;

//判断当前网络连接状态

Network nw=new Network();

if(nw.IsAvailable)

    lbmsg.Text="网络已连接";

else

    lbmsg.Text="网络已断开";

using System.Net.NetworkInformation;
// Constructor
public MainPage()
{
   InitializeComponent();

   // Subscribe to the NetworkAvailabilityChanged event
   DeviceNetworkInformation.NetworkAvailabilityChanged += new EventHandler<NetworkNotificationEventArgs>(NetworkAvailabilityChanged);
}

void NetworkAvailabilityChanged(object sender, NetworkNotificationEventArgs e)
{

   string msg="";
   if(e.IsAvailable)
   {
     msg="网络已连接";

   }
   else
  {
    msg="网络已断开";
  }
  Dispatcher.BeginInvoke(() => {
  lbmsg.Text =msg; }); 
}