public frm_serial(frm_receipt receipt, int ItemId, int ReceiptId)
{
InitializeComponent();
_receipt = receipt;
this._item_id = ItemId;
this._receipt_id = ReceiptId;
}
public frm_serial(frm_receipt receipt, int SerialId)
{
InitializeComponent();
this._receipt = receipt;
this._serial_id = SerialId;
}