winform中在事件中使用线程打开窗口的问题？

[67676373]

private void button1_Click(object sender, System.EventArgs e)
{
Form2 f2=new Form2();
f2.MdiParent=this;
System.Threading.Thread x1 = new Thread(new ThreadStart(f2.Show));
Thread.Sleep(20);
x1.Start();
MessageBox.Show(x1.ThreadState.ToString());//提示说unstarted，已经start()了啊?
}

[Knight94]

Sample as follows:
private void button1_Click(object sender, System.EventArgs e)
{
Form2 f2=new Form2();
f2.MdiParent=this;
System.Threading.Thread x1 = new Thread(new ThreadStart(f2.Show));
x1.Start();
Thread.Sleep(20);
MessageBox.Show(x1.ThreadState.ToString());
}

[67676373]

是我弄错了，线程显示完窗口就销毁了！