BotBuilder-Samples/CSharp/core-Middleware/Global.asax.cs

namespace MiddlewareBot
{
    using System.Web.Http;
    using Autofac;
    using Microsoft.Bot.Builder.Dialogs;

    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            var builder = new ContainerBuilder();
            builder.RegisterType<DebugActivityLogger>().AsImplementedInterfaces().InstancePerDependency();
            builder.Update(Conversation.Container);

            GlobalConfiguration.Configure(WebApiConfig.Register);
        }
    }
}