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Pass only changed control values to another page (c#.net)

Kingshuk_SP asked:

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Suppose I've 500 controls in one asp.net page.
which includes textboxes, dropdownlists, checkboxes, radiobuttons etc..

I've changed value of 2 or 3 controls.

Now, on submit button click, I've to pass the values of those controls, whose values are changed. (like here 2 or 3)

how to do this..? please help ASAP

What I have tried:

I've thought of declaring those controls inside one panel, but I don't know what would be the right approach to achieve this.
Tags: C#3.5

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