Multiple roles in Controller action

i try to create custom role provider in mvc4 to give user access in my site. when i try to using role provider is success. i success create role provider like this ``` [Authorize(Roles = "admin")] ``` my question is, can i use more then one role name in controller? i mean like. ``` [Authorize(Roles = "admin")] [Authorize(Roles = "admin")] ``` try to use this code, but not working for me. any one can show me how does it work? thanks