Create a new turn context for teams bot

Lakshmi_145 - 

Proactive messages are messages that are sent by the bot to start a conversation. You can use this feature to send a sign-in card to the user after the conversation with the agent ends.

1. When the conversation between the agent and the user starts, capture the user's conversation reference and store it. You can get the conversation reference from the turn context of the conversation.

var conversationReference = turnContext.Activity.GetConversationReference();

2. When the agent ends the conversation, use the stored conversation reference to create a new turn context. You can do this by using the ContinueConversationAsync method of the BotAdapter class.

await adapter.ContinueConversationAsync(appId, conversationReference, BotCallback, cancellationToken);

3. In the BotCallback method, send a sign-in card to the user. You can do this by using the SendActivityAsync method of the turn context.

async Task BotCallback(ITurnContext turnContext, CancellationToken cancellationToken)
{
    var signInCard = new SigninCard
    {
        Text = "Please sign in to continue",
        Buttons = new List<CardAction> { new CardAction(ActionTypes.Signin, "Sign In", null, null, null, "https://login.microsoftonline.com") }
    };

    var message = MessageFactory.Attachment(new Attachment
    {
        ContentType = HeroCard.ContentType,
        Content = signInCard
    });

    await turnContext.SendActivityAsync(message, cancellationToken);
}

For more information, you can refer to the following documentation:

• Proactive messages
• Bot authentication
• Sign-in card

Thanks, 

Prasad Das

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