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Controller in separate assembly and routing
public class ShinnyController : Controller
{
    [HttpGet]
    public string Index()
    {
        return "Hello, from Awesome.Mvc.Lib";
    }
}

routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
        namespaces: new [] { "Slick.App.Controllers" }
    );

new [] {"Namespace1", "Namespace2"}

var myRoute  = routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional },
        namespaces: new [] { "Slick.App.Controllers" }
    );

myRoute.DataTokens["UseNamespaceFallback"] = false;