Filter the repeater list dynamically

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VB

ASP.NET

Ajax

I have the following data in the table:
ID Category Product
1 Shoes Puma
2 Shoes Nike
3 Computer Acer
4 Shoes Woodland
5 Computer Lenovo
6 Shoes Reebok

There is a one textbox for Productcolumn and dropdown for Category column in the heade. Dropdown has two values: Computer and Shoes. The Requirement is to filter this list dynamically when user types in textbox i.e on keypress event. Eg if user types 'e', then 2nd, 3rd and 6th row should be shown. If user types another word 'r', then only 3rd row should be shown as the Product name contains 'er' in the string.
I have written the textchanged event for the textbox which filters the list but it happens when focus from textbox is lost not on each key press.

How can this be achieved in .net 2.0?