How to transfer data from form to webrowser controle

Hi all i got a from that looks like pic below . I want to be able transfer data from my textbox form to the webbrowser controle. The html that is loading inside webbrowser controle has 2 textboxs and one submit.

I want the data sent to html form and on submit button the submit get clicked on the html page. I be happy if some one show me how that can be done.Thanks

http://i5.photobucket.com/albums/y18...7/autofill.jpg