Facing problem implementing streaming using directline channel

I have a question

Hello All,

i tried implementing the solution using the below code please let me know what I'm doing it wrong.

i have followed instruction from this file
LIVESTREAMING.md

else if (turnContext.Activity.ChannelId.Equals(Channels.Directline))
            {
                var oldActivity = new Bot.Schema.Activity();

                oldActivity.Type = "typing";
                oldActivity.Text = "Searching your document library...";
                oldActivity.ChannelData = new ChannelData()
                {
                    streamSequence = 1,
                    streamType = "informative"
                };
                var activityid = await turnContext.SendActivityAsync(oldActivity);

                Thread.Sleep(1000);

                oldActivity.Type = "typing";
                oldActivity.Text = "A quick";
                oldActivity.ChannelData = new ChannelData()
                {
                    streamId = activityid.Id,
                    streamSequence = 2,
                    streamType = "streaming"
                };
                await turnContext.SendActivityAsync(oldActivity);

                Thread.Sleep(1000);

                oldActivity.Type = "typing";
                oldActivity.Text = "A quick brown fox";
                oldActivity.ChannelData = new ChannelData()
                {
                    streamId = activityid.Id,
                    streamSequence = 3,
                    streamType = "streaming"
                };
                await turnContext.SendActivityAsync(oldActivity);

                Thread.Sleep(1000);

                oldActivity.Type = "message";
                oldActivity.Text = "A quick brown fox jumped over the lazy dogs.";
                oldActivity.ChannelData = new ChannelData() { streamId = activityid.Id, streamType = "final" };
                await turnContext.SendActivityAsync(oldActivity);
            }

Start with docs/LIVESTREAMING.md at the bot-implementation section and compare its Direct Line requirements with the activity sequence in the issue. Reproduce the reported behavior using the provided C# example and capture the actual result or error. Done means identifying a specific defect with a reproducible case, or confirming the implementation streams successfully.