How to use Range Validator Inside Gridview?

[Rodusa]

Does anybody have any example of how to use validation controls inside
the GridView? Suppose the gridview contains five TextBoxes where user
can input the quantity for example. The Minimum quantity is 0 and the
maximum is 999. I want to bind all these five Texboxes to the
RangeValidator control.
However, the RangeValidator has one property called control to validate
which works pretty well with basic controls such as TextBox, but does
not work with GridView.

thanks

Rod