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Refactoring for AI: Architectural Patterns for Integrating LLMs into Legacy .NET Applications

For those of us who have spent years, or even decades, maintaining and extending large, legacy .NET applications, the current AI boom presents a fascinating, yet daunting, challenge. The business sees the "magic" of AI and, naturally, wants to sprinkle it into our existing products. The request is often simple: "Can we add AI to do X?". But as architects and developers, we know it's never that simple. Bolting a modern, stateless, and often slow-to-respond Large Language Model (LLM) onto a battle-hardened, stateful ASP.NET Web Forms application is a classic case of architectural impedance mismatch. A direct API call from a code-behind file during a postback is a recipe for disaster. It will lead to hanging UI, terrible user experience, and a maintenance nightmare. So, how do we bridge the gap between our monolithic, reliable workhorses and the brave new world of generative AI? The answer isn't a rewrite; it's smart architecture. Here are a couple of patte...