protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); // Set our view from the "main" layout resource SetContentView(Resource.Layout.Main); // Get our button from the layout resource, // and attach an event to it Button button = FindViewById <Button>(Resource.Id.MyButton); button.Click += delegate { button.Text = string.Format("{0} clicks!", count++); }; MyAdapter myAdapter = new MyAdapter(this, 0); myAdapter.RegisterDataSetObserver(new MyDataSetObserver()); }