protected void Application_Start()
{
  var builder = new ContainerBuilder();
  // Register your MVC controllers. (MvcApplication is the name of
  // the class in Global.asax.)
  builder.RegisterControllers(typeof(MvcApplication).Assembly);
  // OPTIONAL: Register model binders that require DI.
  builder.RegisterModelBinders(typeof(MvcApplication).Assembly);
  builder.RegisterModelBinderProvider();
  // OPTIONAL: Register web abstractions like HttpContextBase.
  builder.RegisterModule<AutofacWebTypesModule>();
  // OPTIONAL: Enable property injection in view pages.
  builder.RegisterSource(new ViewRegistrationSource());
  // OPTIONAL: Enable property injection into action filters.
  builder.RegisterFilterProvider();
  // OPTIONAL: Enable action method parameter injection (RARE).
  builder.InjectActionInvoker();
  // Set the dependency resolver to be Autofac.
  var container = builder.Build();
  DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
}