where to put session timeout page redirection code in asp.net?

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VB

ASP.NET

Hi,
I need to check session time out in website. The following code detecting the timeout when i'm put these code undert the file Global.asax.vb in the Subroutine

Sub Application_PreRequestHandlerExecute()
If Session.IsNewSession = True Then
Dim strCookieHEader As String = Request.Headers("Cookie")
If Not strCookieHEader Is Nothing AndAlso strCookieHEader.IndexOf("ASP.NET_SessionId") >= 0 Then

'Redirect to Index page if Session Time Out
Response.Redirect("Index.aspx", True)
End If
End If
End Sub


But the page is not redirecting to specified page. Whats the problem in the code. Is there any idea to use Some other Subroutine or Server.Transfer?