botframework-csharp-v3-google-chart-in-hero-card.cs

private static Attachment GetHeroCard()
{
    var heroCard = new HeroCard
    {
        Title = "BotFramework Hero Card",
        Subtitle = "Your bots — wherever your users are talking",
        Text = "Build and connect intelligent bots to interact with your users naturally wherever they are, from text/sms to Skype, Slack, Office 365 mail and other popular services.",
        Images = new List<CardImage> { new CardImage("http://chart.apis.google.com/chart?chs=200x200&chdlp=b&chtt=Uberman&chdl=Asleep%7CAw&chd=t:11,11,11,11,11,11,11,11,11,11,11,11&cht=p&chco=586F8E,red,586F8E,7D858F,586F8E,7D858F,586F8E,7D858F,586F8E,7D858F,586F8E,7D858F") },
        Buttons = new List<CardAction> { new CardAction(ActionTypes.OpenUrl, "Get Started", value: "https://docs.microsoft.com/bot-framework") }
    };

    return heroCard.ToAttachment();
}