Detect if Windows CE PDA is connected to Network

Question

In my Windows CE application, I need to know if the PDA is connected (before calling web services).

I tried to use OpenNetCF ConnectionManager class but it always indicates a "Disconnected" status.

ConnectionManager connectionManager = new ConnectionManager();
var wifi = ConnectionManager.ConnectionDetailItems.Where(x => x.ConnectionType == ConnectionType.NIC).FirstOrDefault();
connectionManager.Connect(wifi.SourceNetwork, true, ConnectionMode.Synchronous);

When I do that, connexionManager status is always equal to "Disconnected" whereas the static member "ConnectionManager.ConnectionDetailItems" contains an item with my network info.

So I'd like to know how I can use ConnectionManager to determine if the Pad is connected.

PS: my network has no access to the Internet