5 Microsoft Tutorials: Copilot Model Swapping, DeepSeek on Azure, Rust, .NET 10 RC, AI Agents

Five hands-on tutorials from the week of Sept 12, 2026 — hot-swapping the model behind VS Code Copilot Chat, serving DeepSeek v4.1 Flash on Azure AI Foundry, Rust on Windows, .NET 10 RC side-by-side, and your first AI agent in C#.