A asp.net page that tracks changes of a web page?
<p>An asp.net page that tracks a web page changes.
and if any changed occurred then it should send mail to my mailbox which I have configured using smtpclient.</p>

<p>I've coded for this task, but don't know where to place the code which section is executed always? Is there any possibility for this? </p>

<p>If not, then this page should be opened (viewed) always(24x7) or is there any way to open my asp.net page in the server?</p>
