I’ve been working on a fun little project on my stream recently. It’s an app called StreamBadger that adds overlay images and plays sounds on the stream through OBS Studio. It uses the Twitch API so it needs to authenticate with Twitch, and as it’s a desktop application I wanted to build that authentication flow where you log in through the browser and the app sits and waits and then magically gets connected.

I’m a big fan of the Nullable Reference Types feature added in C# 8.0. It lets the compiler catch a bunch of potential runtime errors, and I guarantee if you turn it on you’ll get a bunch of warnings. As of .NET 5.0, the entire BCL is now covered with nullable annotations, and a lot of the extended ecosystem supports them too.