li need ittel help with role

i need some help with role

i design smple website with login page and  home page and thire is page need user to login to view it content and last folder for admin page and

i add config file to addmin folder and i just allow user with role admin to acsse the page

avery thing work fine and user that are't login they automaticlly redirected to login page and then after login they redirect to the page they request

this is work fine with page that  dos't spsesfiy any role just deny any one user

when i reques admin page the user also redirect to login page after login  and this is fine but i don't no what i should do after login ?

i used custom role provider  and i don't  know when i must test the user if he has role for requested page and

how to tell the page that user have role requerd to acsses the page content?

where i must test t ...