How to update Label Id to String through X++ code

static void Lableid2str(Args _args)
{
RetailChannelReport     retailChannelReport;
;
ttsBegin;
while select forUpdate retailChannelReport
{
retailChannelReport.ReportName = SysLabel::labelId2String2(retailChannelReport.ReportName, 'en-us');
print retailChannelReport.ReportName;
retailChannelReport.doupdate();
 }
ttscommit;
pause;
}