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The RoleManagerEventArgs.RolesPopulated property is used to enable or cancel creation of a System.Web.Security.RolePrincipal by the System.Web.Security.RoleManagerModule.
If set to true in the RoleManagerModule.GetRoles event, then the System.Web.Security.RoleManagerModule assumes that role membership for the current user has been verified and any required role membership information has been set up for the current user. No action is taken by the System.Web.Security.RoleManagerModule to create a System.Web.Security.RolePrincipal object for the current user.