I've read that the asp.net (3.5) UpdatePanel sends the entire page back on postback. How can I verify this?
If I want the UpdatePanel functionality without sending back the entire page, would I need to create my own AJAX async and an HTML server side DIV tag to hold everything or just go with a regular Panel? I want to create a CustomPanel that is basically an UpdatePanel but only renders what's in the panel on async calls.
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