Role manager work -  
        Role management helps you manage authorization, 
which enables you to specify the resources that users in 
your application are allowed to access. Role management 
lets you treat groups of users as a unit by assigning users 
to roles such as manager, sales, member, and so on. (In 
Windows, you create roles by assigning users to groups such 
as Administrators, Power Users, and so on.)


Web.config code to restrict users from accessing some pages 
given as below : -

<configuration>
   <location path="memberPages">
       <system.web>
            <authorization>
               <allow roles="BUILTIN\Administrators" />
               <deny users="*" />
            </authorization>
          </system.web>
        </location>
   <!-- other configuration settings here -->
</configuration>