Chirp.Radio.MainPage.OnNavigatedTo C# (CSharp) Method

        protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            var playButton = ApplicationBar.Buttons[0] as ApplicationBarIconButton;
            if (BackgroundAudioPlayer.Instance.PlayerState == PlayState.Playing)
            {
                playButton.Text = "Stop";
                playButton.IconUri = new Uri("/Images/pause.png", UriKind.Relative);
            }
            else
            {
                playButton.Text = "Play";
                playButton.IconUri = new Uri("/Images/play.png", UriKind.Relative);
            }
        }