Bot Framework ConnectorClient ChannelData Sample

ConnectorClientChannelData.cs

var msg = new Activity()
{
    Type = ActivityTypes.Message,
    From = botAccount,
    ChannelId = "facebook",
    Recipient = userAccount,
    Conversation = new ConversationAccount(id: conversationId.Id),
    ChannelData = JObject.FromObject(new
    {
        attachment = new
        {
            type = "template",
            payload = new
            {
                template_type = "button",
                text = "text",
                buttons = new List<object>()
                {
                    new
                    {
                        type = "web_url",
                        url = "https://tw.buy.yahoo.com/",
                        title = "shopping"
                    }
                }
            }
        }
    })
};