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Client-side form validation has become a de-facto standard for modern web applications. However, 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. This article describes how to implement this so that you don't have to write any custom javascript for new validation rules. This even includes remote validation rules and these validation rules that depend on multiple form fields.
Here's the correct URL in case someone else is reading this:
http://devermind.com/aspnet-mvc/asp-net-mvc-tip-4-client-side-form-validation-made-easy-part-2/