Page Validation

[Vi]

Hi,
I have a form which displays some orders based on dates selected or based on
an order number. I have two different buttons for each kind of query, but
both buttons call the same method in the code behind page.
I'm validating the dates and if they're not ok, I set args.IsValid=false;
In the method that retrieves the orders, I check if Page.IsValid.
This way if the dates are not valid, the retrieval by dates is not working,
but so is the retrieval by order number. Even if I would have two different
methods, I would still check Page.IsValid and it would not work.
Is there a way to solve this problem, meaning the “get order by date� button
to depend on the validity of dates text boxes and the validity of the “get
order by order number� button to depend on the validity of the order number
text box?

Thank you.