How do I get Bonjour working on a Mac

I am trying to register a service for discovery using Bonjour and can't seem to get it to work on a Mac.

I created a really simple example showing what I'm doing but all I ever see is the "Bonjour starting search" and "Bonjour will publish service 'Chat Service'". No other Console.WriteLines appear.

Here is my code...

using System; using MonoMac.Foundation; using System.Threading;

namespace BonjourTest { static class TestService { static NSNetService _testService;

    public static void InitTestService()
    {
        _testService = new NSNetService ("", "_testservice._tcp", "Test Service", 28132);

        _testService.Published += delegate(object sender, EventArgs e) {
            NSNetService ns = sender as NSNetService;
            Console.WriteLine("Bonjour published service '{0}'", ns.Name);
        };
        _testService.WillPublish += delegate(object sender, EventArgs e) {
            NSNetService ns = sender as NSNetService;
            Console.WriteLine("Bonjour will publish service '{0}'", ns.Name);
        };
        _testService.PublishFailure += delegate(object sender, NSNetServiceErrorEventArgs e) {
            NSNetService ns = sender as NSNetService;
            Console.WriteLine("Bonjour failed to publish service '{0}'", ns.Name);
        };

        _testService.Publish ();
    }
}

class MainClass
{
    static NSNetServiceBrowser _bonjourBrowserService;

    static void InitBonjourBrowser()
    {
        _bonjourBrowserService = new NSNetServiceBrowser ();

        _bonjourBrowserService.FoundService += delegate(object sender, NSNetServiceEventArgs e) {
            Console.WriteLine("Bonjour found service '{0}'", e.Service.Name);
        };
        _bonjourBrowserService.ServiceRemoved += delegate(object sender, NSNetServiceEventArgs e) {
            Console.WriteLine("Bonjour removed service '{0}'", e.Service.Name);
        };
        _bonjourBrowserService.SearchStarted += delegate(object sender, EventArgs e) {
            Console.WriteLine("Bonjour starting search");
        };
        _bonjourBrowserService.SearchStopped += delegate(object sender, EventArgs e) {
            Console.WriteLine("Bonjour stopped searching");
        };
        _bonjourBrowserService.NotSearched += delegate(object sender, NSNetServiceErrorEventArgs e) {
            Console.WriteLine("Bonjour not searched");
        };

        _bonjourBrowserService.SearchForServices ("_testservice._tcp", "");
    }

    static void Main (string[] args)
    {
        InitBonjourBrowser ();

        TestService.InitTestService ();

        while (true) {
            Thread.Sleep (1000);
        }
    }
}

}