binded textBox update

Question

I am Using a Textbox and a button for submiting textbox text , the
button should be unavailable if there is No text , but , the textbox
"Updates" her Binded property (whitch used by buttun can execute comman
) after it lost focus , and I want the text box to update after each
keystroke ,
I know there is a property that can solve my problem I cant remmember how it's called
thank you ...

Nipun Tomar · Answer

for server side you can use TextChanged event and if you want client side then use TextBox.Attributes.Add( "onkeyup" , "JavascriptToEnableButton()" );