Sharing session between ASP and ASP.NET
The following article in MSDN Discusses how to share session state between classic ASP and Microsoft ASP.NET using Microsoft .NET Framework classes and the serialization feature of the .NET Framework. Sharing session state allows converting existing ASP applications to ASP.NET applications in stages while running the applications side by side.
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/converttoaspnet.asp
ASP.NET represents a new programming paradigm and architecture, and offers many advantages over classic ASP. Although porting from ASP to ASP.NET is not a simple process, the better programming model and improved performance of ASP.NET will make the conversion process worthwhile. With the exception of storing a COM object in the Session object, the approach described in this article offers a solution that will make the migration process simpler.
Very good article, worth a read!