在ASP.NET MVC中，如何允许匿名访问控制器（无需登录）？

I am working in this MVC app made by others, every page requires you to login first. How do I set one of my controllers to work without having to be logged in? At first I thought this was due to the master page but when I removed the master page it still redirects to login when they first browse to the controller action. Is this set in the web.config still like traditional asp.net webforms?I am working in this MVC app made by others, ev