what is view state and why we are using

July 30, 2014
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Michael Verhovski
Visualforce pages that contain a form component also contain an encrypted, hidden form field that encapsulates the view state of the page. This view state is automatically created, and as its name suggests, it holds the state of the page - state that includes the components, field values and controller state.

You could read more about the view state in An Introduction to Visualforce View State (https://developer.salesforce.com/page/An_Introduction_to_Visualforce_View_State) document

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July 30, 2014
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This was selected as the best answer

Deepak Kumar Shyoran
View state contains private,public,global variable etc. You can read more about the view state and how to controll it.As I've wrote a blog on view state which describe best practice to controll the view state to view the current view state of your page .

Please visit the following link whihc describe you how to reduce view state for a page.
http://forcespider.wordpress.com/2013/10/21/how-to-reduce-the-view-state-of-a-page-in-salesforce/

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