public async Task OnTurnAsync()

in SDKV4-Samples/dotnet_core/StateBot/StateBot.cs [53:106]
36 lines of code
4 McCabe index (conditional complexity)

public async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
{
    if (turnContext.Activity.Type == ActivityTypes.Message)
    {
        // Get the state properties from the turn context.
        UserProfile userProfile =
            await _accessors.UserProfileAccessor.GetAsync(turnContext, () => new UserProfile());
        ConversationData conversationData =
            await _accessors.ConversationDataAccessor.GetAsync(turnContext, () => new ConversationData());

        if (string.IsNullOrEmpty(userProfile.Name))
        {
            // First time around this is set to false, so we will prompt user for name.
            if (conversationData.PromptedUserForName)
            {
                // Set the name to what the user provided.
                userProfile.Name = turnContext.Activity.Text?.Trim();

                // Acknowledge that we got their name.
                await turnContext.SendActivityAsync($"Thanks {userProfile.Name}.");

                // Reset the flag to allow the bot to go though the cycle again.
                conversationData.PromptedUserForName = false;
            }
            else
            {
                // Prompt the user for their name.
                await turnContext.SendActivityAsync($"What is your name?");

                // Set the flag to true, so we don't prompt in the next turn.
                conversationData.PromptedUserForName = true;
            }

            // Save user state and save changes.
            await _accessors.UserProfileAccessor.SetAsync(turnContext, userProfile);
            await _accessors.UserState.SaveChangesAsync(turnContext);
        }
        else
        {
            // Add message details to the conversation data.
            conversationData.Timestamp = turnContext.Activity.Timestamp.ToString();
            conversationData.ChannelId = turnContext.Activity.ChannelId.ToString();

            // Display state data.
            await turnContext.SendActivityAsync($"{userProfile.Name} sent: {turnContext.Activity.Text}");
            await turnContext.SendActivityAsync($"Message received at: {conversationData.Timestamp}");
            await turnContext.SendActivityAsync($"Message received from: {conversationData.ChannelId}");
        }

        // Update conversation state and save changes.
        await _accessors.ConversationDataAccessor.SetAsync(turnContext, conversationData);
        await _accessors.ConversationState.SaveChangesAsync(turnContext);
    }
}