Listbox

Question

hii

  i have create one web form.

in that form i had added one textbox n one listbox.

On page load listbox display all client name from database in lixtbox.

Now I want to display--

1- while i type '1' in textbox then listbox only display clientname of '1' clientid.

2-while i typing name starting from 'j' then list box displays all cliename which matches to input that i i typing in textbox.

anybody can help me?

please.