In my previous article about ASP.NET MVC Client-Side validation, I showed how to set up your project so that you don’t have to write any custom JavaScript code for any new validation rules. This approach also covered remote client-side validation – these are rules which require server-side resource in order if a particular input field is valid or not.

Since I wrote the first part of the article, Steve Sanderson adopted my idea of automatic client-side validation and baked a similar feature right into the latest version of xVal.

One important thing is still missing though: What do you do when validation depends on server-side resources but also involves several different form fields? For example, let’s assume you were implementing a form for your website users to update their contact information.

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Client-side form validation has become a de-facto standard for modern web applications. However, replicating server-side validation rules on the client side can be a tedious and error-prone process.

In addition, there are some validation rules which cannot be checked completely on the client side, for example because the validation depends on information stored in the server database. For those rules you need to implement remote client-side form validation.

The xVal framework is great for automatic generation of client-side validation code for some of your server-side validation rules, but it does not support remote client-side validation.

This article shows a fully generic way to implement remote client-side form validation so that

• Validation rules remain solely in your ASP.NET MVC model
• You write each validation rule just once, and only in easily testable C# code. There is no JavaScript or other client-side counterpart .
• There is no need to branch or otherwise modify xVal or jquery.validate
• All you have to do for each new remote form validation rule is to derive from the base class shown in this article.

I’ll describe how to implement this in detail. I’ve also uploaded a demo project showing how this works in action.

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