Event Problem

 I got a ASP.net text box called textbox1 and a label called label1.



When a key is press in a text box i want it to up date the label with

what is in the textbox.



Label1.Text = TextBox1.Text;



But on a ASP.net text box there is no on key press event like this is

on a normal html text box .
 
 
But no ...