i have a dropdownlist control on masterpage in asp.net. I have a database and want to bind the data into a datalist on a content page on Dropdownlist text change . how i use this?

Question

i have a dropdownlist control on masterpage in asp.net.

 I have a database named "onlineshopping" have a table named "product_Details" with column product_Name,product_id, product_category,price etc.

on the content page i m using a dropdownlist to show the record of product on selecting the category from dropdownlist.

 i m usin session object to handle this problm bt i m unable to do this how it is possible.

Plz help..............