title: Im am trying to create custom authorize attribute on my web api mvc 4 application in visual basic
body: <p>I am trying to implement my custom authorize attribute that inherits system.web.http.authorizeAttribute
  in my project i have a web api mvc 4 template and a mvc4 internet application template
  with windows authentication as a client. i have some methods in the web api controller which i am trying to not make accessible for the authenticated user that sends the request
  in exchange if he hits the button that has the custom attribute, a 401 should be return. and also if he is not authenticated the client shouldn't see things that are not authorized to see</p>
  
  <p>please help with some code example!!!</p>