View state is the method that the ASP.NET page framework uses to preserve page and control values between round trips . When the HTML markup for the page is rendered, the current state of the page and values that must be retained during postback are serialized into base64-encoded strings.22 Eki 2014
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The view state is the state of the page and all its controls . It is automatically maintained across posts by the ASP.NET framework. When a page is sent back to the client, the changes in the properties of the page and its controls are determined, and stored in the value of a hidden input field named _VIEWSTATE.
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