Task.Factory.StartNew多线程中将数值实时传递到UI显示

1private void button1_Click(object sender, EventArgs e)
2        {
3            Task t1 = Task.Factory.StartNew(() => k1());
4            Task t2 = Task.Factory.StartNew(() => k2());
5        }
6 
7        void k1()
8        {
9            for (int i = 0; i < 100; i++)
10            {
11                Thread.Sleep(100);
12                this.Invoke(new Action(
13                    () => { this.label1.Text = i.ToString(); }));
14            }
15        }
16 
17        void k2()
18        {
19            for (int i = 0; i < 100; i++)
20            {
21                Thread.Sleep(100);
22                this.Invoke(new Action(
23                    () => { this.label2.Text = i.ToString(); }));
24            }
25        }