ViewState in ASP.NET is a mechanism used by the ASP.NET page framework to store page and control values between page requests. ViewState is preserved in a page even when the page is posted back to the server.

For example, if you have a TextBox control on a page and you set the value of TextBox, when the page is posted back, the value of the TextBox will be retained. This is because the value of the TextBox is stored in the ViewState of the page. The ViewState is stored in a hidden field on the page and is passed back and forth between the server and the client.

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