Task ProgressBar模擬現實完成後顯示TextBox

private async void Form1_Load(object sender, EventArgs e)
        {
            progressBar1.Maximum = 10;
            progressBar2.Maximum = 20;
 
            MyControls mc1 = new MyControls() { pb = progressBar1, tb = textBox1 };
            MyControls mc2 = new MyControls() { pb = progressBar2, tb = textBox1 };
            Task.Factory.StartNew(myThread.fun, mc1);
            Task.Factory.StartNew(myThread.fun, mc2);
        }
 
        public class myThread       //建立一個線程的類 以便類似的進程都能調用它
        {
            public static void fun(object mc)
            {
                MyControls myControls = mc as MyControls;
                //模擬進度條
                while (myControls.pb.Value != myControls.pb.Maximum)
                {
                    myControls.pb.Invoke(new Action(() =>
                    {
                        myControls.pb.Value += 5;
                    }));
                    Thread.Sleep(1000);
                }
                //進度條完成後，textbox顯示信息
                myControls.tb.Invoke(new Action(() => {
                    myControls.tb.Text = myControls.pb.Value.ToString();
                }));
            }
        }
 
        public class MyControls
        {
            public ProgressBar pb { get; set; }
            public TextBox tb { get; set; }
        }

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