Web Reference: Data type validation is based on the .NET type of a property, unless that is overridden by a [DataType] attribute. Browsers have their own default error messages, but the jQuery Validation Unobtrusive Validation package can override those messages. When you use MVC to render form elements from a model using Tag Helpers or HTML helpers it will add HTML 5 data- attributes in the form elements that need validation, as shown below. Dec 2, 2025 · These small attributes, which you place on your model properties, allow you to define validation rules quickly without writing long validation logic manually. In this article, we will explore model validation in ASP.NET Core using data annotations.
YouTube Excerpt: Adding Prop Type Validation
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