ontextchanged attribute of the textbox is not firing

I am using the following line is my code and the onTextChanged event is not firing.
But when I use the onClick event on the same code, it's firing.


textbox1.Attributes.Add("onClick", "SetValue();")


But I need to do my calculations only if the value in the textbox is changed not when the user clicks on the textbox.
Any ideas?


Regards,
Fariborz

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