This repository is a comprehensive collection of sample applications for the Microsoft Windows App SDK (WinUI 3). It demonstrates a wide range of platform features including app lifecycle management (activation, instancing, restart, state notifications), scene graph composition (animations, effects, lighting with ExpressionBuilder), notifications (toast, push), widgets, windowing (custom title bars, multi-window), deployment (packaged/unpackaged, self-contained), Windows AI/ML (ONNX inference, AI Foundry APIs like image captioning and text rewriting), text rendering (DWriteCore), printing, camera capture, custom controls, and XAML Islands interop with WinForms/WPF. The samples are provided in multiple languages (C# and C++/WinRT) and target various app models (WinUI 3, WPF, WinForms, console). The codebase is primarily educational—serving as reference implementations—rather than a production library. It suffers from heavy copy-paste duplication across language/framework variants, hardcoded version numbers, and occasional stale references, but includes a few genuinely reusable components such as the ExpressionBuilder fluent animation library and the ImageLoader async surface management system.