View State in Asp.net

• View State is a mechanism, which page state is maintained between page postbacks.
• View State Control is loaded just before the Load event and Fired just before the render method being invoked.
• View State is 64 bit Encoded.
• View State information is stored in Hidden Fields. 
• Every Asp.net control has EnableViewState property. 
• EnableViewState Mode has two properties. They are True or False.
• If you set EnableViewState property to True, then View State  is enabled for the control.
• If you  set  EnableViewState property to False, then View State  is disabled for the control.
• View State Page information is available with in that page only.We can not access the View State information from one page to another page.

Features of ViewState:-

• A way to track the state of  the control across Postbacks.
• It does not use the server resources.
• Does not time out
• Works with any browser.

View State information can be configured in 3 levels. They are

• Control Level
• Page Level
• Application Level

Control Level:-
<%@output  .....  EnableViewState = "True/False" %>

Page Level:-
<%@Page Language="C#" EnableViewState = "True/False" %>

Application Level:-
It Requires a Configuration file i.e Web.Config.