Deleting duplicate records in Table through code in X++

static void DeleteDuplicate(Args _args)
{
Set fieldset = new set(types::Integer);

// create dictindex from unique index 

DictIndex dictIndex = new dictIndex (tablenum(PurchTable), indexnum(PurchTable,PurchIdx));

;

// these are fields from index

// add them to set

fieldset.add(fieldnum(PurchTable ,OrderAccount));

ReleaseUpdateDB::indexAllowDup(dictIndex);

// set allow duplicates

ReleaseUpdateDB::deleteDuplicatesUsingIds(tablenum(PurchTable),0,fieldset);

//reenable duplicates

ReleaseUpdateDB::indexAllowDup(dictIndex);

info("Deletion done");


}