Dynamic text box control creation and text_changed event code

Question

Hi all,

          Here I am creating dynamic text box control and i want to fire text_changed event to this created text box. But i have query on this event,

Example i need to display HELLO when text changed so code

response.write("HELLO");

Now my query is the above line where i need to write or how i need to call the function(set of code) to fire when text_changed event fired, why because we are creating and firing this event dynamically.

Please help me..

thank you