❔ What did I do wrong with this task formation?

        public async Task Numbers(TextBox textbox, CancellationToken token)
        {
            Random rnd = new Random();
            while (token.IsCancellationRequested == false)
            {
                textbox.Text = rnd.Next(1, 10).ToString();
                await Task.Delay(100);
            }
        }

        public async void Check(TextBox textbox, Button button)
        {
            CancellationTokenSource cts = new CancellationTokenSource();
            if (button.Text == "Launch")
            {
                Task.Run(() => Numbers(textbox, cts.Token), cts.Token);
                button.Text = "Stop";
            }
            else if (button.Text == "Stop")
            {
                cts.Cancel();
                button.Text = "Launch";
            }
        }