Thanks a lot for your help :)
I found the right way to soolve mu problem.

But now I have another question :)
How to bind with DataGrid I know:) It's easy :)
I need to bind data from my objects (NHibernate), to DataSet. I need such thing to get the ability to do In-Place Editing in my DataGrid. All exmaples and samples posted on many sites describing exactly this method of realization. But to do In-Place Edit I need to operate woth DataSet :)
So can you help me, and post some code may be, that shows how to bind data with DataSet inHibernate context?:)

Or is there any other way to do In-Place Editing?:)

Thank to all. The problem no longer exist :)