多線程同時操作介面使用互斥體

private void button4_Click(object sender, EventArgs e)        {            Mutex m = new Mutex();            autoevent = new AutoResetEvent(false);            Thread t = new Thread(delegate()            {                Thread.Sleep(500);                for (int i = 0; i < 50000; i++)                {                    m.WaitOne();                    try                    {                        label1.Invoke                        (                            (MethodInvoker)                            delegate                            {                                label1.Text = i.ToString();                            }                        );                    }                    finally                    {                        m.ReleaseMutex();                    }                }            });            t.Start();            Thread t2 = new Thread(delegate()            {                for (int i = 0; i < 50000; i++)                {                    m.WaitOne();                    try                    {                        label1.Invoke((System.Action)delegate()                        {                            label1.Text = i.ToString();                        });                    }                    finally                    {                        m.ReleaseMutex();                    }                }            });            t2.Start();        }