[2005] Check remote file exists

[Bulldog]

I implemented some code I found elsewhere on this forum to check for the existence of a remote file.

Public Function IsFileAvailable(ByVal FileLink As String) As Boolean
        Dim objUrl As New System.Uri(FileLink)
        Dim objWebReq As System.Net.WebRequest
        Dim objResp As System.Net.WebResponse
        objWebReq = System.Net.WebRequest.Create(objUrl)
        Try
            objResp = objWebReq.GetResponse
            objResp.Close()
            objWebReq = Nothing
            Return True
        Catch ex As Exception
            objWebReq = Nothing
            Return False
        End Try
    End Function

But if I search for a remote file that I know does not exist, I get a 404 error response and the function bombs out, it does not jump to the Catch? Can anyone see what Im doing wrong?