Multithreading in asp.net

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ASP.NET

ListBox

multi-threading

Hi,

I was just trying to print 100 numbers in two listboxes simultaneously using multithreading.I put the controls inside the update panel.And when i click on the button they print only 0.I am new in asp.net so kindly help me to fix this.My coding is shown below.

protected void Button1_Click(object sender, EventArgs e)
    {
        try
        {
            Thread tid1 = new Thread(new ThreadStart(this.Thread1));
            Thread tid2 = new Thread(new ThreadStart(this.Thread2));

            tid1.Start();
            tid2.Start();
        }
        catch
        {
        }
    }
    public void Thread1()
    {
        try
        {
            for (int i = 0; i < 100; i++)
            {
                ListBox1.Items.Add(i.ToString());
                Thread.Sleep(10);
            }
        }
        catch (Exception ex)
        {
            Label1.Text = ex.Message;  
        }
    }
    private void Thread2()
        {
            try
            {
                for (int i = 0; i < 100; i++)
                {
                    ListBox2.Items.Add(i.ToString());
                    Thread.Sleep(10);
                    
                }
            }
            catch
            {
            }
        }