public new void NewsPictureInsert(NewsPicture entity)
        {
            // check permission: admin
              PrincipalPermission permAdmin = new PrincipalPermission(Thread.CurrentPrincipal.Identity.Name, "Administrator");
              permAdmin.Demand();

              TraceCallEnterEvent.Raise();
              try
              {
            // check required fields:
            if (entity.Title.Length == 0)
              throw new ArgumentNullException("NewsPicture.Title", "A képaláírás nincs megadva.");
            if (entity.PictureUrl.Length == 0 || entity.PictureUrl == DBString.Null)
              throw new ArgumentNullException("NewsPicture.PictureUrl", "A fájlnév nincs megadva.");

              if (entity.PictureData == null || entity.PictureData.Length == 0)
            throw new ArgumentNullException("NewsPicture.PictureData", "A kép nincs megadva.");

            // logical checks:
            string ext = Path.GetExtension(entity.PictureUrl).ToLower();
            if (!(ext.Equals(".gif") || ext.Equals(".jpg") || ext.Equals(".jpeg")))
              throw new ApplicationException("Csak jpeg vagy gif formátumú kép csatolható.");

            FileDataContext fileDataContext = new FileDataContext();
            string fileName = entity.ID.ToString() + ext;
            fileDataContext.NewsPictureInsert(entity.NewsRef, fileName, entity.PictureData);
            base.NewsPictureInsert(entity);

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