asp.net role-based authentication controlling confidence groups active directory

i am attempting something rudimentary (i thought) - securing concentration controlling roles-based confidence controlling active office groups the domain.

specifically, i need show/hide equipment page depending on presumably now logged user biased domain\groupa active directory. reason, challenging awaiting information controlling active office this. all i seem goes sum controlling forms-based authentication controlling roles, uses db store information.

all i wish the already epitomised confidence structure the active directory. someone greatfully explain i need?

do i need:

1. <rolemanager enabled="true"/> web.config


2. <allow roles ="domain\groupa"/> web.config


3. iis set windows authentication


4. if (user.isinrole(@"domain\groupa")){ //do things } page?

what else am i missing? anything? 'cause the working. heh.

thanks your help.