How can I implement NHibernate session per request without a dependency on NHibernate?

Why don't you create an IHttpModule and perform your creation and disposing there (probably in the Begin_Request and End_Request events), but put your IHttpModule inside the project that has your NHibernate dependency. Eg.

In my opinion, you should embrace the ISession and work with it directly. The problem with many session-per-request implementations is that they delay committing database changes until the end of the HTTP request. If the transaction fails, all you can do at that point is direct the user to a generic error page.

It's much better to manage the transaction on the page so that you can catch and handle errors more effectively. If you take this route then you need to access the ISession or a wrapper to control the transaction.

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