how to use Pageload events.

hi

How to Fire Pageload event for this situation.
here i refer this url
http://ajax.net-tutorials.com/controls/updateprogress-control/

but here when we will click update fire progress event i need fire this
thread page load event i put like this but not firing how will do this

This Code not working why?

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
System.Threading.Thread.Sleep(4000)
End Sub

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