public  bool IsAllow(PagePermission.PERMISSION permission)
 {
     if (System.Web.HttpContext.Current.User.IsInRole(System.Configuration.ConfigurationManager.AppSettings["GroupAdmin"]))
         return true;
     
     List<Role> listRole = GetRolesForPermission(PagePermission.Parse(permission));
     foreach (Role role in listRole)
         if (System.Web.HttpContext.Current.User.IsInRole(role.Name))
             return true;
     return false;
 }