Web Reference: Jan 30, 2026 · Learn how to build production-ready custom validation attributes in .NET. This guide covers everything from simple validators to complex cross-property validation with dependency injection support. Data annotations in .NET provide a declarative way to validate model properties. For scenarios that the built-in validation attributes don't handle, you can create custom validation attributes. Create a class that inherits from ValidationAttribute, and override the IsValid method. In this article, I will discuss How to Create Custom Validation Data Annotation Attributes in ASP.NET Core MVC Applications with Real-Time Examples. Please read our previous article discussing Data Annotation Attributes in ASP.NET Core MVC.
YouTube Excerpt: In this screencast Mohammad Azam will demonstrate how to
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