ASP and ASP.NET work perfectly together. I am surprised at how important people are in terms of session state. Most of the new ASP.NET that I migrated to an existing ASP site does not need any session state stored in the ASP application. Having said that, I am not using session state at all in ASP or ASP.NET.
The only difficult thing is to find a common login mechanism, I do this using a custom session cookie and a record in the database.
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