ASP.NET MVC 2, “Request Validation has detected a potentially dangerous client input value, and processing of the request has been aborted” and the ValidateInput does not work

If you have problems getting the [ValidateInput(false)] attribute to work in a Visual Studio 2010 ASP.NET MVC 2 solution; please remember to put requestValidationMode="2.0" on the httpRuntime element of the web.config.

Then everything will be fine. Enjoy.