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

Question

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.