public override void Close()
{
VerifyResult(_cco.Close());
_cco.DataEvent -= (_IOPOSPointCardRWEvents_DataEventEventHandler)_cco_DataEvent;
_cco.DirectIOEvent -= (_IOPOSPointCardRWEvents_DirectIOEventEventHandler)_cco_DirectIOEvent;
_cco.ErrorEvent -= (_IOPOSPointCardRWEvents_ErrorEventEventHandler)_cco_ErrorEvent;
_cco.OutputCompleteEvent -= (_IOPOSPointCardRWEvents_OutputCompleteEventEventHandler)_cco_OutputCompleteEvent;
_cco.StatusUpdateEvent -= (_IOPOSPointCardRWEvents_StatusUpdateEventEventHandler)_cco_StatusUpdateEvent;
_cco = null;
}
