求教，关于多线程的设计问题！！！

Question

我写了一个这样的模拟程序 ，想要实现在载入界面的时候开始线程1，在线程1中开始线程2并等待线程2结束后再次运行线程1，如此循环往复 ，小弟菜鸟一枚，希望大家可以帮我指出错误，告诉我怎样修改
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

    bool sign = true;
    Thread thread;
    bool sign2 = false;
    Thread thread2;


    private void Form1_Load(object sender, EventArgs e)
    {
        sign = true;
        thread = new Thread(delegate() { ReadData(); });
        thread2 = new Thread(delegate() { ReadData2(); });
        thread.Start();  
    }

    private void ReadData()
    {
        while (sign)
        {
            if (checkBox1.Checked == true)
            {
                textBox1.Invoke(new EventHandler(delegate { textBox1.AppendText("这是线程1的结果\r\n"); }));
                thread2.Start();
                clearParam();
            }
        }
    }

    private void ReadData2()
    {
        sign2 = true;
        textBox1.Invoke(new EventHandler(delegate { textBox1.AppendText("这是线程2的结果\r\n"); }));
    }

    private void clearParam()
    {
        sign = false;
        thread = new Thread(delegate() { ReadData(); });
        thread.Start();
    }
}

Answer 1

要等待某个线程结束，需要用 WaitForSingleObject() 来等待线程句柄。