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ML.NET Tutorial 2026: Build Your First ML Model in C#

Learn machine learning in C# with this ML.NET tutorial. Build, train, and deploy your first ML model step by step in .NET — start coding in minutes. If you have been searching for a practical ML.NET tutorial that actually gets you from an empty project to a working prediction, this guide is for you. Machine learning in C# is no longer a niche experiment — with ML.NET, Microsoft's open-source machine learning framework for .NET, you can build, train, evaluate, and deploy models entirely in C#, without leaving Visual Studio and without writing a single line of Python. In this tutorial you will build your first machine learning model: a sentiment analysis classifier that reads customer reviews and predicts whether they are positive or negative. More importantly, you will understand why each step exists. Most tutorials show you a pipeline and stop. This one explains what a transform actually does to your data, why you must split your dataset before training, and which metrics...