asp.net - User permissions on certain views based on roles -

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i using asp.net mvc 3. please excuse terminology. assign roles people @ work, use windows authentication determine roles user has. lets roles rolea, roleb , rolec. list of roles user. lets says usera belongs rolea , roleb. of views need authenticated not can view views. lets viewa can viewed users belong roles rolea , roleb. how this? need into? when user not belong these roles tries access views he/she should redirected error page.

also, need sort of helper method check these roles used in views hide/display controls. best place use this?

any sample code / articles appreciated.

[authorize(roles = "rolea,roleb")] public actionresult foo() {     return view(); }

and if want check roles in view:

@if (user.isinrole("rolea")) {     <div>this visible users in rolea</div> }

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