If you caught our session at Microsoft Build 2026 or you've been watching the repo, you've seen this one taking shape in public for a while now, and a lot has changed since Build. Here's the longer tour: Microsoft.UI.Reactor, an experimental C# framework that brings the MVU (Model-View-Update) pattern to WinUI desktop apps. No XAML files, no code...

Lets jump straight into how to create a Unit Test project for WinUI Desktop, using MSTest!

Lets create a simple app with C#/NET5 and see how we can register it as a Windows Service, logging information into the Windows Event Viewer, and moving some files around based on the outputs of a Machine Learning Model.

Lets learn how to parse command-line arguments in a C#/.NET5 application, and how a simple NuGet package can make this process much easier and declarative.

Lets get our hands down and create a simple .NET5 console app that uses WinML to analyse an image and classify what it is using a pre-built machine learning model.

Microsoft released Windows UI Library (WinUI) 3, an evolution of the UWP/XAML platform, that decouples the XAML UI framework from the Windows OS, and ships it in its whole as a NuGet package, effectively allowing developers to support new features of XAML on older versions of Windows 10 without the need of end-users to upgrade their OS.