Your final step for handling bad controller names is to tell ASP.NET MVC to use your custom controller factory. To make that happen, you just need to insert a line into the Application_Start method of ...

Task Support For Async Controllers, introduced in ASP.NET MVC 4, makes it much easier to write non-blocking code in controllers which can further use asynchronous methods themselves.

One of the nice things about many of the ASP.NET MVC action filters is that you don't have to apply them to every Action method -- you can bang one onto a Controller to cover all the methods in the ...