how do i send tweet message with data from my site to twitter account

I need to post a twitter开发者_Go百科 message from my website passing custom message. I used twitter buton but according to requirement i need to send the message after submitting particular form. how do i do this without using twitter button. is there any api for this.

Yes, there is an API for that, fully documented, on http://dev.twitter.com/

EDIT: Some full .NET sample area available at http://dev.twitter.com/docs/open-source-examples#By_LanguagePlatform