CSharp-Coder

Learn how to build an AI chatbot in C# with the OpenAI API. Step-by-step .NET 8 tutorial with streaming, history & function calling. Start coding now! Building an AI chatbot is one of the most in-demand skills for .NET developers in 2026, and the good news is that the C# OpenAI API integration story has never been better. With the official OpenAI .NET SDK, you can go from an empty console project to a fully functional, streaming, context-aware chatbot in under an hour. In this complete tutorial, you'll learn how to build an AI chatbot with C# and the OpenAI API from scratch — including conversation history, streaming responses, function calling, and the production best practices most tutorials skip. We'll explain not just how each piece works, but why it's designed that way, so you can adapt this foundation to web apps, Blazor, ASP.NET Core APIs, or desktop applications. What You'll Build and What You Need By the end of this tutorial you'll have a c...