private void button1_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart (One));
            thread.Start();
        }
        public void One()
        {
            progressBar1.Value = 0;
            progressBar1.PerformStep();
                   }
    }
接着怎么完善我的代码啊  后面改怎么写呢