>I think method 1 will be slow, since i have to create a cursor, then create the CSV file ( that's 2 files in disk ) then filetostr() it...
>I need fast, since this is in a web service where i have to transform the response array into a string

May not be slow at all - Fox has the building of long strings optimized better than c++, IIRC. I've built rather long strings (dozens of kilobytes, sometimes perhaps a hundred or two) and it still served a page in milliseconds. May be worth a try - and the tediousness, c'mon, writing this thread already took longer than that loop :).