How do i get Sales Force and Google Adwords working on a form on my website that's built the asp.net platform, and the form submit code is handled in the code file (VB)?

Before sending the form data to Sales Force, I process the form data into the site's database and send confirmation emails. After that I send the form data over to Sales Force via the System.Net.WebClient object.

Sales Force receives the Lead data (so i know it makes it to Sales Force) but this data is not going into the Adwords section.

Sales Force/Adwords help pages only show how to pass the forms over via javascript and the Post attribute.

There has to be a way to send over the data via the code side (VB) and get it insert into the Google Adwords portion of Sales Force. Can anyone help?