Show Processing messages in web application as like in window application

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ASP.NET

Hello,

As window application show processing messages(e.g-in Gtalk when connect then show connecting to server... etc)

I want to show this type of custom messages in my web application how can i do this i tried this code.

protected void Page_Load(object sender, EventArgs e)
    {
        lbl_message.Text = "Part 1 Data";
        Thread.Sleep(10000);
        lbl_message.Text = "Part 2 Data";
    }

But it show last label message ("Part 2 Data") directly

Please help

Thanks
Srishti