Software developer can turn on encryption for an individual page using ViewStateEncryption-Mode property of the Page directive:
The developer can set the same attribute in a configuration file:
<configuration xmlns =https://scemas.microsoft.com/.NetConfiguration/V2.0>
Note: Encryption imposes a performance penalty, because the web server will perform the encryption and decryption with each postback. Don’t encrypt view state if you don’t need to do it.