public class StructureMapControllerFactory : DefaultControllerFactory
{
    protected override IController GetControllerInstance(Type controllerType)
    {
        if (controllerType == null)
            throw new ArgumentNullException("controllerType");

        return ObjectFactory.GetInstance(controllerType) as Controller;
    }
}

protected void Application_Start()
    {
        RegisterRoutes(RouteTable.Routes);

        Bootstrapper.ConfigureStructureMap();

        ControllerBuilder.Current.SetControllerFactory(new StructureMapControllerFactory());
    }

if(controllerType == null)
    return base.GetControllerInstance(controllerType)

background: url(img/logo.gif);

routes.IgnoreRoute("{Content}/{*pathInfo}");

routes.IgnoreRoute("{*favicon}", new {favicon=@"(.*/)?favicon.ico(/.*)?"})