how to judge a page edited or not from server client
<p>a input asp.net page,you can image many input fields and a button named submit on it. 
before user submit the page ,I want to  compare all the fields values with default values . if anyting didn't change ,i will give him a message.
here it is the question:
 how to judge a page edited or not from server client(in button click event)?<br>
i don't want compare each field in page. </p>
