Initial Hypothesis: Store data against the user profile, or a custom list and retrieve using Linq/CAML or use session state. Session state is not supported by SP2010 OOTB and it can have severe performance implications.
Resolution: enable ASP.NET session state. This stores the session state in a SQL Server database. Start the Powershell cmd prompt:
Enter the following PowerShell command in the SharePoint 2010 Management Shell window:
orEnable-SPSessionStateService -DatabaseName "ASPNet_State" -DatabaseServer "spdemo.dev" -SessionTimeout 30Each web application for which you want Edit the web.config file and set the enableSessionState property of the pages element as follows:
More Info:
http://www.kajanmoorthy.com/2010/05/enable-session-state-in-sharepoint-2010.html
http://todd-carter.com/post/2010/04/30/A-Session-State-By-Any-Other-Name.aspx
