How do I create a search code interface like google default page. I mean when I type any words into textbox and then it shows a listbox below next to textbox?

As far as I know textbox control in ASP.NET has no event key press. Then how do I create a code search when I typing any words in textbox it will show a list box data corresponding that word (like googole page default). I hope you can show me the way to create. Thanks a lot.