Using RoleService for Role Based Forms Authentication in ASP.NET AJAX

In my previous article Using Authentication Services in ASP.NET AJAX for Forms Authentication we have understood how to use the authentication service to provide forms authentication in ajax applications. Most of the times, we will also have number of roles to provide different set of permissions to different users. The ASP.Net AJAX Extensions 1.0 released for ASP.Net 2.0 does not have an inbuilt service like authentication service that provides roles support.