asp.net如何在事件中启动线程来打开一个页面

  在页面点击一个按钮，其目的是在按钮中做两件事情，一件需要点击按钮马上完成，另一件事情是点击按钮后做其他事情。如果按顺序一次做完感觉特别耗时，下面简单罗列一下。[csharp] view plaincopyprint?
protected void Button1_Click(object sender, EventArgs e) 
    { 
        Label1.Text = TextBox1.Text; 
 
      //在这做第一件事情     protected void Button1_Click(object sender, EventArgs e)
    {
        Label1.Text = TextBox1.Text;
       //在这做第一件事情[csharp] view plaincopyprint?
dowork(); 
       dowork();[csharp] view plaincopyprint?
//做完后马上启动线程  
     System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadChild)); 
     thread.Start(); 
 } 
       //做完后马上启动线程
        System.Threading.Thread thread = new System.Threading.Thread(new System.Threading.ThreadStart(ThreadChild));
        thread.Start();
    }
    线程中处理完后打开一个窗口
    public void ThreadChild()
    {
            Label2.Text = DateTime.Now.ToString();
             //Response.Write("");
             //响应http必然报错
             //Response.Write("<script>window.open('login.aspx','','');</script>");
             //通过注册即可打开窗口
              Page.RegisterStartupScript("", "<script>window.open('login.aspx','','');</script>");
     }