public void Start()
{
if (_broadcastReceiver == null)
{
// Create the broadcast receiver and bind the event handler
// so that the app gets updates of the network connectivity status
_broadcastReceiver = new NetworkStatusBroadcastReceiver();
_broadcastReceiver.ConnectionStatusChanged += OnNetworkStatusChanged;
// Register the broadcast receiver
Application.Context.RegisterReceiver(_broadcastReceiver,
new IntentFilter(ConnectivityManager.ConnectivityAction));
}
}