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NetworkAvailability event won't fire or handler isn't seeing it

My application needs to know when the network availability has changed and
do some stuff when it does.

I wrote a small WinForms app to test System.Net.NetworkAvailabilityChanged.
It works great.

I put the same logic in my main application, and the event is never caught
by my handler.

If I put in NetworkAddressChanged, it *is* fired and caught. But I don't
need to know if the address changed, I need to know if the user is online or

Here's my code:

In the constructor of my main form after InitializeComponent(). (Note: It
doesn't work if I move it to the load event either.)

updateNetworkStatus(NetworkInterface.GetIsNetworkA vailable());
NetworkChange.NetworkAvailabilityChanged +=
NetworkAvailabilityChangedEventHandler(myNetworkAv ailabilityChangedHandler);

And here's my event handler:

private void myNetworkAvailabilityChangedHandler(object sender,
NetworkAvailabilityEventArgs args)

And here's the last method:

private void updateNetworkStatus(object state)
//do stuff
System.Diagnostics.Debug.Print("***Network status changed to {0}.***",
One blog I found recommended this in the event handler:

this.Invoke(new WaitCallback(updateNetworkStatus), args.IsAvailable);

instead of just calling updateNetworkStatus.

That doesn't work either, and I'm not sure why I would use that over just
calling it.

Any help or advice would be greatly appreciated.


Apr 11 '08 #1
0 1299

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