'宣言 Sub AddItem( _ ByVal newItem As System.String _ )
void AddItem( System.string newItem )
multiCombo.AddItemSeparator = ","; for (int i = 0; i < 10; i++) multiCombo.AddItem($"1val{i},2val{i},3val{i}");
ISupportUnboundMode インターフェース ISupportUnboundMode メンバ