X++ code for Updating main contact worker in customer master

static void UpdatingCustomerMaster(Args _args)
{
 CustTable   _custTable,custMaster;
 int         updatedCount;

 updatedcount = 0;

    ttsBegin;

    while select forUpdate _custTable
        where _custTable.MainContactWorker == 0  &&
              _custTable.SalesGroup == 'RAB'//'SHI'
    {
        _custTable.MainContactWorker = 5637158830;///5637158827;
        _custTable.update();
        updatedCount++;
    }
    ttsCommit;
    info(strFmt("No Of Records Updated:%1 ",updatedCount));
    info('done');
}