Best practices for handling SecurityException

I have locked a set of administration pages on a website using the PrincipalPermission syntax ie:

<PrincipalPermission(SecurityAction.Demand, Role:=RoleBLL.ROLE_NAME_ADMINISTRATOR)> <PrincipalPermission(SecurityAction.Demand, Role:=RoleBLL.ROLE_NAME_ICON_REP_EDITOR)> Partial Class admin__ASPNET_RepEditor     Inherits System.Web.UI.Page


<PrincipalPermission(SecurityAction.Demand, Role:=RoleBLL.ROLE_ ...