Web Reference: This article shows how to annotate your models, use the annotations for data validation, and handle validation errors in your web API. When a client sends data to your web API, often you want to validate the data before doing any processing. Nov 8, 2025 · Model validation is your first line of defence. It ensures the data your API receives is well-structured, complete and confirms to expected rules, before it enters your business logic or... Introduction When building APIs using ASP.NET Core Web API, ensuring that incoming data is valid is extremely important. Invalid or incomplete data can cause bugs, security issues, and poor user experience. This is where Model Validation in ASP.NET Core using Data Annotations becomes very useful. Data Annotations allow you to define validation rules directly on your model classes. ASP.NET Core ...
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