I have an ASP.NET MVC project and I have a single action that accepts GET, POST, and DELETE requests. Each type of request is filtered via attributes on my controllers
i don't believe this is possible. the method attribute of form elements in HTML4 & XHTML 1.0 will only accept GET or POST. in addition, standard configs of most webservers will deny DELETE and PUT requests. assuming you have configured your webserver to allow methods like PUT / DELETE (such as WebDav does), you could then create your own HTTP request:
DELETE /resource.html HTTP/1.1
Host: domain.com
and handle it appropriately. however, there's no way to do this via a current HTML form. for interest's sake, there is some discussion for DELETE support in HTML5.