dynamically created textbox textchanged()

hi,


i am facing a problem in dynamically generated textbox it is like i am able to get textbox dynamically but the problem is with every textbox.textchanged () when i am calling this function , at the time of pageload dynamically generated text box are vanishing so i am unable to get them back.


so please let me know to do that , i am forwarding the sample code
tbNum.TextChanged += new EventHandler(tbNum_TextChanged);


protected void tbNum_TextChanged(object sender, EventArgs e)
{
Response.Write("Hello world");
}


thanking you,