google url probleam in vb.net

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ASP.NET

hello friend

i have i issue,in google index my duplicate url are create but this url redirect my orignal url i have develop this code

Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
       ' Code that runs when a new session is started
     

       Dim urldata() As String
       Dim casturl As String
       Dim str As String
       str = Request.RawUrl.ToString
       If str.EndsWith(".aspx") Then
           Exit Sub
       End If
       If Not str.EndsWith(".html") Then
           urldata = Split(str, "=")
           casturl = urldata(urldata.Length - 1).ToString()
           Dim con As New SqlConnection(System.Web.Configuration.WebConfigurationManager.ConnectionStrings("abc").ConnectionString)
           Dim cmd As New SqlCommand
           con.Open()
           cmd.CommandType = Data.CommandType.Text
           cmd.CommandText = "select catName from pqr where catId IN(select parentId from categories where catId IN(select categoryId from registerdata where navTag='" & casturl & "'))"
           cmd.Connection = con
           Dim geturl As String
           geturl = Convert.ToString(cmd.ExecuteScalar)
           Response.Redirect("http://www.example.com/ads-" & Trim(geturl) & "/" & Trim(casturl) & ".html")
       End If



   End Sub

this code is work only for first time..i am click other link that is not working

plz help me

thank u