代码如此：
 protected void Button1_Click(object sender, EventArgs e)
    {
        ThreadStart mythread = new ThreadStart(Create);
        Thread thread = new Thread(mythread);
        thread.Start();
        Response.Write(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));

    }
    public void Create()
    {
        FileStream ds = File.Create(@"d:\1.txt");
        StreamWriter sw = new StreamWriter(ds);
        sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
        Thread.Sleep(5000);
        sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
        sw.Close();
        sw.Dispose();
        ds.Close();
        ds.Dispose();
    }