Global.asax.cs

using Autofac;
using System.Web.Http;
using System.Configuration;
using System.Reflection;
using Microsoft.Bot.Builder.Azure;
using Microsoft.Bot.Builder.Dialogs;
using Microsoft.Bot.Builder.Dialogs.Internals;
using Microsoft.Bot.Connector;
using System;

namespace SimpleEchoBot
{
    public class WebApiApplication : System.Web.HttpApplication
    {

        protected void Application_Start()
        {
            // Bot Storage: This is a great spot to register the private state storage for your bot. 
            // We provide adapters for Azure Table, CosmosDb, SQL Azure, or you can implement your own!
            // For samples and documentation, see: https://github.com/Microsoft/BotBuilder-Azure
            var docDbServiceEndpoint = new Uri(ConfigurationManager.AppSettings["DocumentDbUrl"]);
            var docDbEmulatorKey = ConfigurationManager.AppSettings["DocumentDbKey"];

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

                    var store = new DocumentDbBotDataStore(docDbServiceEndpoint, docDbEmulatorKey);
                    builder.Register(c => store)
                    .Keyed<IBotDataStore<BotData>>(AzureModule.Key_DataStore)
                    .AsSelf()
                    .SingleInstance();
                    // Using Azure Table Storage
                    //var store = new TableBotDataStore(ConfigurationManager.AppSettings["AzureWebJobsStorage"]); // requires Microsoft.BotBuilder.Azure Nuget package 

                    //// To use CosmosDb or InMemory storage instead of the default table storage, uncomment the corresponding line below
                    //// var store = new DocumentDbBotDataStore("cosmos db uri", "cosmos db key"); // requires Microsoft.BotBuilder.Azure Nuget package 
                    //// var store = new InMemoryDataStore(); // volatile in-memory store

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

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