private LoadOperation <Web.Model.taxpayerdocument> LoadTaxPayerDocument()
        {
            EntityQuery <Web.Model.taxpayerdocument> lQuery = documentManagerContext.GetTaxpayerdocumentQuery();

            if (SelectTaxPayerEntity != null)
            {
                lQuery = lQuery.Where(c => c.taxpayer_id == SelectTaxPayerEntity.TaxPayerId);
            }
            else
            {
                lQuery = lQuery.Where(c => c.taxpayer_id == -100);
            }
            return(documentManagerContext.Load(lQuery.SortAndPageBy(taxPayerDocumentView)));
        }