Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive – Page Rendering Error

In my web project for all the pagers I was inheriting from base page. Then I realize that in VS it gives and error in HTML design mode saying  “Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive.”

The issue was that I was using session object in the OnInit method in my base class.so then I move my code to OnLoad mothod and then in VS the rendering error disappeared.

BTW in first scenario also when I run the code it worked well.

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