protected override void SearchObject() { var saleno = this.txtSaleNo.Text; DateTime aftdate = dateEdit1.DateTime; DateTime bfedate = dateEdit2.EditValue != null ? dateEdit2.DateTime : new DateTime(2100, 1, 1); var saleOrderList = m_SaleClient.getSaleOrderList(saleno, aftdate, bfedate); this.gcSaleOrder.DataSource = saleOrderList; }