Do you use MVC Unobtrusive Validation
  v4.0 Posted at 15/03/2017 3:05 PM by Brendan Richards
​Validation is an important part of any data driven web application. Client-Side validation provides fast user feedback and a better UI experience but cannot be relied on for data integrity - so client-side validation should always be backed by additional server-side validation.
With MVC Unobtrusive Validation, you can configure both client-side and server-side in one place. 

​Validation rules can be added to a model object via Data Annotations or using the Fluent Validation API.
Fluent Validation is available as a Nuget package.


OK Example: Data Annotation attributes decorate model properties to make them required


Better Example: Fluent Validation allows validation meta data to be added to a class without modifying the original class.  This provides much more flexibility for code reuse.

If you create a new MVC web application in VisualStudio 2013, unobtrusive validation will be enabled by default. Otherwise it's simple to install from Nuget​. To use it simply:

  1. Bind your razor views to model objects 
  2. Use Html Helpers to render the form UI​

Good Example: this razor view binds to a strongly​​ typed model object and uses html helpers.

Figure: the HTML UI rendered for this view now has data-validation attributes that are followed by JQuery validation to provide rich client-side validation.

Figure: On the server-side, the same validation rules will be checked when you call ModelState.IsValid

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