Global.asax.cs

using System.Web.Http;

namespace BasicMultiDialogBot
{
    using System.Reflection;

    using Autofac;

    using Microsoft.Bot.Builder.Azure;
    using Microsoft.Bot.Builder.Dialogs;
    using Microsoft.Bot.Builder.Dialogs.Internals;
    using Microsoft.Bot.Connector;

    public class WebApiApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            Conversation.UpdateContainer(
                builder =>
                {
                    builder.RegisterModule(new AzureModule(Assembly.GetExecutingAssembly()));

                    // Bot Storage: Here we register the state storage for your bot. 
                    // Default store: volatile in-memory store - Only for prototyping!
                    // 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 store = new InMemoryDataStore();

                    // Other storage options
                    // var store = new TableBotDataStore("...DataStorageConnectionString..."); // requires Microsoft.BotBuilder.Azure Nuget package 
                    // var store = new DocumentDbBotDataStore("cosmos db uri", "cosmos db key"); // requires Microsoft.BotBuilder.Azure Nuget package 

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

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