// from www.danielmoth.com/Blog/

internal static class MyNetwork
{
  public static event System.Action ConnectionEstablished;

  public static void MonitorNetworkAvailability()
  {
    MyNetwork.CheckConnection();
    System.Net.NetworkInformation.NetworkChange.NetworkAddressChanged += (sender, e) => MyNetwork.CheckConnection();
  }

  public static bool IsConnected
  {
    get
    {
      MyNetwork.CheckConnection();

      return _isConnected;
    }
    private set
    {
      if (_isConnected != value)
      {
        _isConnected = value;
        if (value == true && ConnectionEstablished != null)
        {
          ConnectionEstablished();
        }
      }
    }
  }

  private static void CheckConnection()
  {
    System.Threading.ThreadPool.QueueUserWorkItem(_ =>
     MyNetwork.IsConnected = (Microsoft.Phone.Net.NetworkInformation.NetworkInterface.NetworkInterfaceType !=
         Microsoft.Phone.Net.NetworkInformation.NetworkInterfaceType.None));
  }

  [System.Diagnostics.Conditional("DEBUG")]
  internal static void DebuggerChangeStatus(bool isConnected)
  {
    _isConnected = !isConnected;
    MyNetwork.IsConnected = isConnected;
  }

  private static bool _isConnected;
}