ELMAH Error Signalling (ASP.NET)

Question

I've got the code below up and running. It captures the user name and the browser that was used to access an intranet site. How can I modify the code so that ELMAH logs a specific StatusCode to the ELMAH_Error table in SQLServer? The eventual goal is the ability to extract out of the log these specific log entries to identify which PC's need to be upgraded.

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

    Dim ExceptionMessage As New StringBuilder
    ExceptionMessage.Append(System.Security.Principal.WindowsIdentity.GetCurrent.Name + " accessed the site using " + Request.Browser.Browser + " " + Request.Browser.MajorVersion.toString + "." + Request.Browser.MinorVersion.tostring)
    Dim NewException As New NotSupportedException(ExceptionMessage.ToString)
    Elmah.ErrorSignal.FromCurrentContext().Raise(NewException)

End Sub