catch ex.innerexception in the smtpclass vb.net2008

am trying to catch the inner exception for the smtpclass with this code below, but it give another error saying the innerexception is not defined

Try
    mail.To.Add(lstRecipients(i))

    Try
        开发者_运维知识库SetStatus("Sending:-" & lstRecipients(i))
        smtp.Send(mail)
        lSent += 1
        bwrkMain.ReportProgress(i + 1)
        SetStatus("Sent:-" & lstRecipients(i))
        lSent += 1
    Catch ex As SmtpFailedRecipientsException
        bwrkMain.ReportProgress(i + 1)
        SetStatus("Error:-" & lstRecipients(i) & " - " &
            ex.InnerException.Message)
    End Try
Catch ex As Exception
    SetStatus("Error:-" & lstRecipients(i) & " - " & ex.Message)
End Try

The InnerException is not defined, have a look at the Exceptions within Exceptions section

Make sure to check that your InnerException is not Nothing before trying to use it:

If Not(ex.InnerException Is Nothing) Then
     SetStatus("Error:-" & lstRecipients(i) & " - " &
            ex.InnerException.Message)
End If