private void CorporationChange(object sender, EventArgs e) { list = (List <StorageVO>)dgv.DataSource; CorpValue = cboCorporation.SelectedValue.ToInt(); List <FactoryVO> factoryInfo = fs.FactoryComboBindings(CorpValue); factoryInfo.Insert(0, new FactoryVO { factory_id = 0, factory_name = "전체" }); cboFactoryName.ComboBinding(factoryInfo, "factory_id", "factory_name"); dgv.DataSource = ss.SelectStorage(CorpValue); cboFactoryName.SelectedIndexChanged += FactoryChange; }