IChromecastLocator locator = new MdnsChromecastLocator();
var chromecasts = await locator.FindReceiversAsync();
//If that does not return devices on desktop then you can use this, Where 192.168.1.2 is your machines local ip
var chromecasts = await locator.FindReceiversAsync("192.168.1.2");

var chromecast = chromecasts.First();
var client = new ChromecastClient();
await client.ConnectChromecast(chromecast);
_ = await client.LaunchApplicationAsync("B3419EF5");

var media = new Media
{
	ContentUrl = "https://commondatastorage.googleapis.com/gtv-videos-bucket/CastVideos/mp4/DesigningForGoogleCast.mp4"
};
_ = await client.GetChannel<IMediaChannel>().LoadAsync(media);