protected override async Task OnMembersAddedAsync(IList <ChannelAccount> membersAdded,
ITurnContext <IConversationUpdateActivity> turnContext,
CancellationToken cancellationToken)
{
foreach (var member in membersAdded)
{
if (member.Id != turnContext.Activity.Recipient.Id)
{
await turnContext.SendActivityAsync(_welcomeDialog.Create(), cancellationToken);
}
}
}
