public static int LoadLookUp(this ComboBox objCombo, int?Parent_CodeID) { LookupManager objLookupManager = new LookupManager(BMC.CashDeskOperator.BusinessObjects.oCommonUtilities.CreateInstance().GetConnectionString()); IList <LookupObject> objColLookUp = objLookupManager.GetLookupObject(Parent_CodeID); objCombo.ItemsSource = objColLookUp; objCombo.DisplayMemberPath = "DisplayText"; objCombo.SelectedValuePath = "CodeID"; objCombo.SelectedIndex = 0; return(0); }