Session sharing between ASP and ASP.NET
The question comes back every so often, so I thought I'd
post about it.
Almost all existing solutions are intrusive and need to
modify the code of the ASP application, the
ASP.NET
application or both. All solutions incur a performance cost
as the data has to be marshaled between the COM world of ASP
and the .NET world of
ASP.NET.
First, there’s a solution in MSDN:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/converttoaspnet.asp
but it necessitates modifications on both sides and needs a
database, which could degrade the application’s performance.
There are also a few commercial products, all in the $200 to
$300 range:
http://www.consonica.com/solutions/statestitch/
which just requires one include on top of each ASP page that
uses the session. One drawback is that it doesn’t support
COM objects in the session, except for Dictionary.
http://www.sessionbridge.com/
which requires more code changes to all places where the ASP
session is used.
And then, there is my own approach, which is the only one
that I know of that requires no source code change anywhere
(except a few very particular cases), but it’s just a proof
of concept, nothing I would use in a production environment
(we have no performance data):
http://www.dotnetguru.org/articles/us/ASP2ASPNET/ASP2ASPNET.html
And a very similar attempt which may scale better:
My own approach is shared source, so anyone is free to improve on it.