SMTP, SDO, C#

Using rwa access to CDO, I can set the accound being used for a mail message, as well as specify the message be HTML.

I can not see how to do this using the Web.Mail. namespace objects (MailMessage, SmtpServer, SmtpMail).

What am I missing???ps: I have seen the threads relating to adding fields. However these methods are not available. I am using Framework 1.0 with DevStudio 2002. Upgrading is NOT an option due to client requirements.
Thispage, in the .NET Class Library, provides an example of how to send an email. I have used it with v1.0 in the past, even though it states that the syntax is based on the .NET Framework v1.1.