When you have Microsoft Windows SharePoint Services (WSS) installed on your
computer and when you browse the page that is set with session variables in the
Microsoft ASP.NET Web application, you may receive the following error message:
Session state can only be used when enableSessionState is set to true,
either in a configuration file or in the Page directive
The article below explains the situation more thoroughly.
Session state cannot be used in ASP.NET with Windows SharePoint Services
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