>called the method from the Load event (this.oClass.SetEnvironment)

Hmmm, is oClass an object on your form, or an object reference to another instance somewhere? If it is an object on the form, it should work as it stands, otherwise it needs to be changed.

>Now that I have a private data session - can I access one of the tables in the session wiht a method or proc outside the form?

Yes, if you pass the DataSessionID property so the datasession can be moved to it (then reset, of course :-).