<ul><li>Input validation in ASP.NET is crucial to ensure correct, secure, and usable data within applications.</li><li>In .NET Core, Data Annotations and Fluent Validation are two primary tools for input validation in MVC applications.</li><li>Data Annotations use attribute-based approach for enforcing validation rules, while Fluent Validation offers a more flexible, programmatic way to define rules.</li><li>Data Annotations are simpler and integrated tightly with ASP.NET MVC's model-binding and validation pipeline, while Fluent Validation offers greater flexibility and maintainability for complex scenarios.</li></ul>

Comparing Data Annotations and Fluent Validation in .NET Core

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