ASP.Net/Session Cookie/Application Error

In case of application error send out email (VB.net)

<%@ Import Namespace="System.Web.Mail" %>
<script language="VB" runat="server">
   Sub Application_Error(sender As Object, e As EventArgs)
      Dim ex As Exception = Server.GetLastError()
      If Not ex Is Nothing Then
         Dim Mail as New MailMessage()
         "Change the values below to valid email addresses
         "Mail.To = <valid email address>
         "Mail.From = <valid email address>
         Mail.Subject = "error"
         Mail.Body = "An Exception occurred in page " & _
            Request.RawUrl & ":" & vbCrLf
         Mail.Body &= ex.ToString() & vbCrlf & vbCrlf
         Mail.Body &= "was handled from Application_Error."
         "If your SMTP server is not local, change the property below
         "   to a valid server or domain name for the SMTP server
         SmtpMail.SmtpServer = "localhost"
         SmtpMail.Send(Mail)
         Server.ClearError()
      End If
   End Sub
</script>