C# 多线程网页访问

private void button1_Click(object sender, EventArgs e)
{
Thread t = new Thread(new ThreadStart(htm));
t.Start();
}
void htm()
{
this.html.Text = GetPageHtml(" xxx ");
}
这样错~~~~~~希望帮我改下 给出源码

private void button1_Click(object sender, EventArgs e)
        {
            Thread t = new Thread(new ThreadStart(htm));
            t.Start(); 
        }
        void htm(object param)
        { 
        this.html.Text = GetPageHtml(" xxx ");
        }