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The SessionStateStoreData.Items property references the session-state variables that are exposed to ASP.NET application code using the System.Web.SessionState.HttpSessionState class, which is accessed using the System.Web.HttpContext.Session property of the current System.Web.HttpContext or the System.Web.UI.Page instance.
By default, session-state variables are managed using the System.Web.SessionState.SessionStateItemCollection object. Custom session-store implementers can supply their own implementation of the System.Web.SessionState.ISessionStateItemCollection interface.