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Let's see why UpdatePanels are not always a good solution. UpdatePanels are very simple and it is very easy to turn your classic aspx pages into ajax-enabled pages. However, this has its own downsides: 1. Each request includes full ViewState that travels to the server and back to the client 2. Full web page lifecycle still remains 3. The size of the response is still large since the whole portion of HTML markup is rendered