uptodateview.cs

cardJson = await ApproveAsset(turnContext.Activity.Conversation.Id, turnContext.Activity.From);
var attachment = new Attachment
{
    ContentType = AdaptiveCard.ContentType,
    Content = JsonConvert.DeserializeObject(cardJson),
};

var messageActivity = MessageFactory.Attachment(attachment);
messageActivity.Id = turnContext.Activity.ReplyToId;
await turnContext.UpdateActivityAsync(messageActivity);