private void _SendMessage(string text)
        {
            //Put the user's text into a message part, which has a MIME type of "text/plain" by default
            MessagePart messagePart = layerClient.NewMessagePart(text);

            //Formats the push notification that the other participants will receive
            MessageOptions options = new MessageOptions();

            options.InvokePushNotificationMessage(MainActivity.GetUserID() + ": " + text);

            //Creates and returns a new message object with the given conversation and array of
            // message parts
            IMessage message = layerClient.NewMessage(options, messagePart);

            //Sends the message
            if (activeConversation != null)
            {
                activeConversation.Send(message);
            }
        }
        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            // Set our view from the "main" layout resource
            SetContentView(Resource.Layout.Main);

            // Get our button from the layout resource,
            // and attach an event to it
            Button button = FindViewById <Button>(Resource.Id.MyButton);

            button.Click += delegate
            {
                LayerClient layerClient = MyApp.Instance.LayerClient;

                // Creates and returns a new conversation object with sample participant identifiers
                Conversation conversation;
                if (layerClient.Conversations.Count == 0)
                {
                    conversation = layerClient.NewConversation("948374839");
                }
                else
                {
                    conversation = layerClient.Conversations[0];
                }

                // Create a message part with a string of text
                MessagePart messagePart = layerClient.NewMessagePart("text/plain", Encoding.UTF8.GetBytes("Hi, how are you?"));

                // Creates and returns a new message object with the given conversation and array of message parts
                IMessage message = layerClient.NewMessage(messagePart);

                // Sends the specified message to the conversation
                conversation.Send(message);
            };
        }