public new void EmailAttachmentInsert(EmailAttachment entity)
        {
            // check permission: admin
              PrincipalPermission permReg = new PrincipalPermission(Thread.CurrentPrincipal.Identity.Name, "Registered");
              PrincipalPermission permAdmin = new PrincipalPermission(Thread.CurrentPrincipal.Identity.Name, "Administrator");
              permReg.Union(permAdmin).Demand();

              TraceCallEnterEvent.Raise();
              try
              {
            // check required fields:
            if (entity.Name.Length == 0)
              throw new ArgumentNullException("EmailAttachment.Name", "A csatolt fájl aláírása nincs megadva.");
            if (entity.Path.Length == 0)
              throw new ArgumentNullException("EmailAttachment.Path", "A csatolt fájl neve nincs megadva.");
            if (entity.FileData == null || entity.FileData.Length == 0)
              throw new ArgumentNullException("EmailAttachment.FileData", "A csatolt fájl nincs megadva, vagy nem létezik.");

            // logical checks:
            string ext = Path.GetExtension(entity.Path).ToLower();
            FileDataContext fileDataContext = new FileDataContext();
            string fileName = entity.ID.ToString() + ext;
            fileDataContext.EmailAttachmentInsert(entity.EmailRef, fileName, entity.FileData);
            entity.FileSize = entity.FileData.Length;
            entity.CreatedDate = DateTime.Now;
            base.EmailAttachmentInsert(entity);

            BusinessAuditEvent.Success();
            TraceCallReturnEvent.Raise();
            return;
              }
              catch (Exception ex)
              {
            ExceptionManager.Publish(ex);
            BusinessAuditEvent.Fail(
              new EventParameter("Exception", ex.ToString())
              );
            TraceCallReturnEvent.Raise(false);
            throw;
              }
        }