How to use Autofac to MVC and Web API

Web API:

  public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            GlobalConfiguration.Configure(WebApiConfig.Register);
            AutofacConfig.ConfigureContainer(GlobalConfiguration.Configuration);
        }
 
    }

    public class AutofacConfig
    {
        public static void ConfigureContainer(HttpConfiguration config)
        {

            var builder = new ContainerBuilder();

            builder.RegisterApiControllers(Assembly.GetExecutingAssembly()).InstancePerRequest();
            builder.RegisterWebApiFilterProvider(config);

            builder.RegisterModule();

            var container = builder.Build();
         
            //config.DependencyResolver = new AutofacWebApiDependencyResolver(container);
            GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver(container);
        }

    }

WEB:

    public class AutofacConfig
    {
        public static void ConfigureContainer()
        {

            var builder = new ContainerBuilder();
            builder.RegisterControllers(Assembly.GetExecutingAssembly());

            builder.RegisterModule();
            builder.RegisterType().As();
            var container = builder.Build();
            DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
        }
    }