how do solve this error for sending mail in vb.net?

[sathyan_8294]

i am using vb.net 2003.i am doing my project in vb.net windows application.the following code is for sending mail.

Dim mymailmessage As New MailMessage
Try
Dim bSuccess As Boolean = True
mymailmessage.From = FromTextBox.Text
mymailmessage.To = "[email protected]"
mymailmessage.Bcc = sb.ToString
mymailmessage.Subject = SubjectTextBox.Text
mymailmessage.Body = MessageTextBox.Text
mymailmessage.BodyFormat = MailFormat.Text
mymailmessage.Priority = MailPriority.Normal
SmtpMail.SmtpServer = "127.0.0.1"
SmtpMail.Send(mymailmessage)
DisplayLabel.Text = "Your Mail was Successfully Sent"
Catch ex As Exception
MessageBox.Show(ex.Message)

End Try

the above code,i written in vb.net windows application.
i run the project,then i click send button means,the following error is display.
"Could not access 'CDO.Message' object"
how to solve this?plz help.