MVC 3 Unobtrusive Client Validation and Unobtrusive Ajax Overview As you may be aware, ASP.NET MVC 3 allows the possibility of using unobtursive client validation and unobtrusive Ajax. If enabled, in a nutshell this means that the stock Microsoft JavaScript libraries for both Ajax and validation (MicrosoftAjax.js and MicrosoftMvcValidation.js respectively) have been effectively swapped out ...