protected override async Task OnMembersAddedAsync(IList <ChannelAccount> membersAdded, ITurnContext <IConversationUpdateActivity> turnContext, CancellationToken cancellationToken)
{
foreach (var member in membersAdded)
{
// Greet anyone that was not the target (recipient) of this message.
// To learn more about Adaptive Cards, see https://aka.ms/msbot-adaptivecards for more details.
if (member.Id != turnContext.Activity.Recipient.Id)
{
var welcomeCard = CreateAdaptiveCardAttachment();
var response = MessageFactory.Attachment(welcomeCard);
response.Speak = MainDialog.SSML("Hello from your pizza service. We bake the best Italian pizza in town! In Italy pizza falls into two distinct categories: Italian pizza and the rest of the world. You will never feel the same about this simple and delicious food again.");
await turnContext.SendActivityAsync(response, cancellationToken);
await Dialog.RunAsync(turnContext, ConversationState.CreateProperty <DialogState>("DialogState"), cancellationToken);
}
}
}