Simple AJAX progress information

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Ajax

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ASP.NET4

How can I output the current progress information in a label?
I tried to use the code below, but don't get a refresh of the panel - except on the end of the script. If I replace the button with a timer and use the timer.tick-event instead of button.click it works.

[VB.net sample code]

Protected Sub buttin1_Click(sender As Object, e As EventArgs) Handles button1.Click
    dim iCount as integer = 0
    For each row as datarow in tbl.rows
        '...do somethig...
        system.threading.thread.sleep(1500)
        i+=1
        info1.text = "Done " & i & " / " & tbl.rows.count & " rows.< br />"
    next
    
    info1.text &= "Complete."
end sub

[ASP.net sample code]

<asp:ScriptManager ID="ScriptManager1" runat="server" />
<asp:UpdatePanel runat="server" ID="updatePanel1" UpdateMode="Always">
	<ContentTemplate>
                <asp:Button runat="server" ID="button1" Text="do something" />
        	<asp:Literal runat="server" ID="info1" />
	</ContentTemplate>
</asp:UpdatePanel>e