That's right. And if you have 20 customers over their credit limit (although I don't know why customers would be allowed to go over, that is why it is called a "limit"), you will get a list of 20 customers. Everytime the timer fires. Is this what you want?

>that's exactly how i wanted.i liked the idea of keeping separate file for searching.but i am afraid timer will slow the system because on each timer, a query will go on server database to read values. is there any other solution ?
>thanks very much
>john still