ModalPopUpExtender - How to make it a DLL?

Question

Hi,

I would like to make a dll and use it in my web site page load event. Here is what I would like to do in my dll:

• Retrieve Data from a table (user,count), if count is 0 then display this modal pop up.

• if modal pop up is displayed then update count to 1

Is there a way to implement this?

Best Regards.