current value of all the controls
HTTP ( Hyper Text Transfer Protocol) is a stateless protocol. When the client disconnects from the server, the ASP.Net engine discards the page objects. This way each web application can scale up to serve numerous requests simultaneously without running out of server memory.
However, there need to be some technique to store the information between requests and to retrieve it when required. This information i.e., the current value of all the controls and variables for the current user in the current session is called the State.
ASP.Net manages four types of state:
- View State
- Control State
- Session State
- Application State
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. When the page is again post back the _VIEWSTATE field is sent to the server with the HTTP request.
The view state could be enabled or disabled for:
- The entire application –by setting the EnableViewState property in the <pages> section of config file
- A page –by setting the EnableViewState attribute of the Page directive, as <%@ Page Language=”C#” EnableViewState=”false” %>
- A control –by setting the EnableViewState property.
It is implemented using a view state object defined by the StateBag class which defines a collection of view state items. The state bag is a data structure containing attribute/value pairs, stored as strings associated with objects.
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