Test Box on typing, Repeater Binding

Hi,

Scenario:

I have a text box and Data table Cache.

Wher ever i start typing in the text box, a event need to be fired and that text will be the filter for the Cache.

The filtered Cache will be binded to the repeater.

Now,i ve done:

on text box keyUp event i will fire a invisible button click event in the server side from there rest of the ma logic is working.

There is a perfomance issue.

Please any body can suggest a better option than this.

Thanks in advance..