Global.asax.cs

using Autofac;
using Autofac.Integration.WebApi;
using Microsoft.Bot.Builder.Azure;
using Microsoft.Bot.Builder.Dialogs.Internals;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Web.Http;
using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Connector;
using Microsoft.Bot.Sample.DocumentDb.Controllers;
using Microsoft.Bot.Sample.DocumentDb.Dialogs;
using Microsoft.WindowsAzure.Storage;


namespace Microsoft.Bot.Sample.DocumentDb
{
    public class Global : System.Web.HttpApplication
    {
        protected void Application_Start(object sender, EventArgs e)
        {
            {
                //Using the local DocDbEmulator, which should be installed and started. Otherwise, edit the docDbEmulatorUri and docDbEmulatorKey variables to your DocDb database
                //Reference: https://docs.microsoft.com/en-us/azure/documentdb/documentdb-nosql-local-emulator

                //Fixed docDb emulator local Uri.
                Uri docDbEmulatorUri = new Uri("https://localhost:8081");

                //Fixed docDb emulator key
                const string docDbEmulatorKey = "C2y6yDjf5/R+ob0N8A7Cgv30VRDJIWEHLM+4QDU5DE2nQ9nDuVTqobD4b8mGGyPMbIZnqyMsEcaGQy67XIw/Jw==";

                var config = GlobalConfiguration.Configuration;

                Conversation.UpdateContainer(
                    builder =>
                    {
                        builder.RegisterModule(new AzureModule(Assembly.GetExecutingAssembly()));

                        var store = new DocumentDbBotDataStore(docDbEmulatorUri, docDbEmulatorKey);

                        builder.Register(c => store)
                            .Keyed<IBotDataStore<BotData>>(AzureModule.Key_DataStore)
                            .AsSelf()
                            .SingleInstance();

                        // Register your Web API controllers.
                        builder.RegisterApiControllers(Assembly.GetExecutingAssembly());
                        builder.RegisterWebApiFilterProvider(config);

                    });

                config.DependencyResolver = new AutofacWebApiDependencyResolver(Conversation.Container);
            }

            // WebApiConfig stuff
            GlobalConfiguration.Configure(config =>
            {
                config.MapHttpAttributeRoutes();

                config.Routes.MapHttpRoute(
                    name: "DefaultApi",
                    routeTemplate: "api/{controller}/{id}",
                    defaults: new { id = RouteParameter.Optional }
                );
            });
        }

        public static ILifetimeScope FindContainer()
        {
            var config = GlobalConfiguration.Configuration;
            var resolver = (AutofacWebApiDependencyResolver)config.DependencyResolver;
            return resolver.Container;
        }
    }
}