Firing An Event When Textbox Text Is Changed?

Jul 2, 2010

i have a strange requirement, let us suppose my screen looks something like this

when im changing value in "Value 1", the summary textbox value must be changed to "N/A". check the image below

as you can see from the image, the cursor is still inside the "Value 1" textbox, im still typing the text in "Value 1" textbox, and i want "Summary" textbox text to be changed to "N/A".

if nothing is changed in "Value 1" then i dont want to change the value of "Summary" textbox.

i want the same functionality for "Value 2" textbox

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