dynamically adding controls to page

Hello,

I'm trying to add controls to page without postback with ajax.

The following code works but it adds the controls at once not one by one. I want that it dynamically adds and show the controls.

I've seen several php sites that dynamically refresh the page content one by one without postback.

C# code:

protected void Button1_Click(object sender, EventArgs e)
{

   System.Net.WebClient c = new System.Net.WebClient();
   for (int i = 0; i < 10; i++)
   {
      string result = c.DownloadString("http://www.gmail.com");
      Label lbl = new Label();
      lbl.ID = "lbl" + i.ToString();
      lbl.Text = "lbl" + i.ToString();
      UpdatePanel1.ContentTemplateContainer.Controls.Add(lbl);
      UpdatePanel1.Update();

      System.Threading.Thread.Sleep(500);
   }

}

HTML code:

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />
</ContentTemplate>
</asp:UpdatePanel>

We need this because In our free seo tools website we have several tools that we need to show the results to users dynamically.

You may see a page that we want to work this way, http://www.onlineseoanalyzer.com/Free-SEO-Tools/Free-Backlink-Generator.aspx

This tool generate backlinks on appr. 100 websites for a given website, but it shows the result after all backlink generation completed. We want to show the result for every backlink generation is done.