private int LoadCatalogs(DateTimeOffset lastUpdate)
        {
            SetCatalogsLabel();
            Catalogs catalogs = webService.GetCatalogs(lastUpdate);

            loadService.DownLoadCatalogs(catalogs);
            webService.ConfirmUpdateCatalogs(catalogs.Items.Select(x => x.Id));
            return(catalogs.Items.Count());
        }