Interview Questions on ViewState

FAQS on ASP.NET StateManagement

<< State Management	ViewState >>
1. Can the HTML controls retain state across postbacks?
No
2. Can the Asp.Net web server controls retain state across postbacks?
Yes, For all Asp.Net web server controls ViewState is enabled by default, to maintain the state between multiple roundtrips.
3. What is a Viewstate?
The ViewState property provides a dictionary object for retaining values between multiple requests for the same page.
4. Where will View State data stored?
When the page is processed, the current state of the page and controls is hashed into a string and saved in the page as a hidden field.(Web page HTML)
5. How do you Enable/Disable a ViewState of Asp.Net server control on a page?
Every asp.net server control has a property called EnableViewState. We can set it to true/false. By default it is set to true for every web server control
6. In which page life cycle event we can access the ViewState Data?
Page_Init event
7. How a ViewState data stored in a page?
ViewState data is hashed into a string and saved in the page as a hidden field. For example: <input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUJNzgzNDMwNTMzDxYCHgJpZAUGdGVzdElkZGQ3YjU2QEici7mzF6IA0sPhKHRhrQ==" />
8. How can you enable ViewState encryption for an application?
To configure view state encryption for an application does the following: <Configuration> <system.web> <pages viewStateEncryptionMode="Always"/> </system.web> </configuration>
9. How can you enable ViewState encryption at page level?
<%@page -- ViewStateEncryptionMode=”Always”%>
10. Is ViewState of one page available to other page?
No, ViewState of a page is available only in that page. You can not access ViewState of one page in other page.
<< State Management	ViewState >>