textbox default value is updating

Question

Dear all,

I have default value property for textbox and will return default value.

Initially my textbox is having value of 'abc'

and in my javascript I am getting value of my textbox.and i change textbox value 'abc' to 'def'. now default value property of textbox is returning 'def'..

I dont want update default value attribute.  I should able to get my default value of textbox, which is assigned at page load level after lot of postbacks.. how to do this?

I can't use hidden variable because i have n controls.

let me know any alternate options.