Is it possible to place an aspx page inside the update panel of another aspx page? If so, how can I do that?
you could try out UFrame (Update Panel + IFrame), have a look at http://uframe.codeplex.com/
You can put the UFrame in your main.aspx, and specify the src property to your existing aspx page, as below:
In mainpage.aspx:
<div class="UFrame" id="UFrame1" src="ExistingPage.aspx" >
<p>This should get replaced with content from Existingpage.aspx</p>
</div>
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