Hi, I’ve worked in a multithreading routine; this routine access to the data base using NHibernate but it fails.
The massage I find is {"There is already an open DataReader associated with this Command which must be closed first."}

Could anybody help me?

Probably is because you're sharing the ISession across the Threads.
Remember that behind a ISession there is a Connection, and you can execute only one query at once. ;)

Hi, thanks for your reply.
I'm just getting a session in each thread, then I execute the query and finally I close the session. the error that i'm getting now is "Creating a proxy instance failed"

That happened to me when I'm trying to load an Entity which is defined as "lazy" and it isn't defined as virtual properties and not sealed.

Also you need to define the "proxy" attribute in the entity ".hbm.xml" pointing to the class itself.

See this chapter:
http://www.hibernate.org/hib_docs/nhibe ... ce-proxies

Hope it works!

I've defined the "proxy" attribute in the entities ".hbm.xml" pointing to the class itself, but I continue getting the same error message.

Are all the properties, methods & delegates declared as "virtual"?
Is the class defined as sealed? If so, "un-seal" it...

All the properties, methods & delegates are declared as "virtual" and
the class isn't defined as sealed