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The viewstate and controlstate are both saved by the server and then retrieved to keep your page and controls state. The default behavior is that these states are saved into a hidden field on the page so that at postbacks the server will be able to read these states back from the hidden field and retrieve the sates prior the postbacks. Is this good? Could it be better? How about saving the states on server? If you need to know more about this, you can read this article.