What do you understand by “ViewState”?


“ViewState” is an ASP.NET technique which is used to hold pre-existing data in the controls of the page when the page is posted back otherwise which would have been lost. The “ViewState” data is not stored in the server rather it is transported to and from from the server. 

The data contained in the “ViewState” is stored as name value pairs, it actually stores the ID of the control and its value rather than the control itself in an encrypted format. 

It is stored in a hidden field called “_VIEWSTATE”. When we look at the page source it will show up something like this


Be very diligent in using the ViewState from within the code behind as it only adds to the overhead of the page to be displayed. Code to user the ViewState from within the code behind as shown below


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