BotBuilder-Samples/CSharp/skype-CallingBot/Controllers/MessagesController.cs

namespace EmergencyServicesBot
{
    using System;
    using System.Net;
    using System.Net.Http;
    using System.Threading.Tasks;
    using System.Web.Http;
    using Microsoft.Bot.Connector;

    [BotAuthentication]
    public class MessagesController : ApiController
    {
        /// <summary>
        /// POST: api/Messages
        /// Receive a message from a user and reply to it
        /// </summary>
        public async Task<HttpResponseMessage> Post([FromBody]Activity activity)
        {
            if (activity.Type == ActivityTypes.Message)
            {
                ConnectorClient connector = new ConnectorClient(new Uri(activity.ServiceUrl));
                
                // calculate something for us to return
                int length = (activity.Text ?? string.Empty).Length;

                // return our reply to the user
                Activity reply = activity.CreateReply($"You sent {activity.Text} which was {length} characters");
                await connector.Conversations.ReplyToActivityAsync(reply);
            }
            else
            {
                this.HandleSystemMessage(activity);
            }

            var response = Request.CreateResponse(HttpStatusCode.OK);
            return response;
        }

        private Activity HandleSystemMessage(Activity message)
        {
            if (message.Type == ActivityTypes.DeleteUserData)
            {
                // Implement user deletion here
                // If we handle user deletion, return a real message
            }
            else if (message.Type == ActivityTypes.ConversationUpdate)
            {
                // Handle conversation state changes, like members being added and removed
                // Use Activity.MembersAdded and Activity.MembersRemoved and Activity.Action for info
                // Not available in all channels
            }
            else if (message.Type == ActivityTypes.ContactRelationUpdate)
            {
                // Handle add/remove from contact lists
                // Activity.From + Activity.Action represent what happened
            }
            else if (message.Type == ActivityTypes.Typing)
            {
                // Handle knowing tha the user is typing
            }
            else if (message.Type == ActivityTypes.Ping)
            {
            }

            return null;
        }
    }
}