ConfigureServicesOld.cs

  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
    // Add services to the collection
    services.AddOptions();

    // create a container-builder and register dependencies
    var builder = new ContainerBuilder();

    builder.RegisterModule(new AutofacModule());

    builder.Populate(services);

    var container = builder.Build();

    // this will be used as the service-provider for the application!
    return new AutofacServiceProvider(container);
  }