ObservableCollection<Chromecast> chromecasts = await ChromecastService.Current.StartLocatingDevices();
//If that does not return devices on desktop then you can use this, Where 192.168.1.2 is your machines local ip
ObservableCollection<Chromecast> chromecasts = await ChromecastService.Current.StartLocatingDevices("192.168.1.2);

var chromecast = chromecasts.First();
SharpCasterDemoController _controller;
ChromecastService.Current.ChromeCastClient.ConnectedChanged += async delegate { if (_controller == null)_controller = await ChromecastService.Current.ChromeCastClient.LaunchSharpCaster(); };
ChromecastService.Current.ChromeCastClient.ApplicationStarted += 
async delegate { 
	while (_controller == null)
	{
		await Task.Delay(500);
	}

	await _controller.LoadMedia("https://commondatastorage.googleapis.com/gtv-videos-bucket/CastVideos/mp4/DesigningForGoogleCast.mp4", "video/mp4");
};
ChromecastService.Current.ConnectToChromecast(chromecast);