Get the id value from the owning entity key, usually the same as the key, but might be some
            other property, in the case of property-ref 
            
Namespace: NHibernate.TypeAssembly: NHibernate (in NHibernate.dll) Version: 3.2.0.4000 (3.2.0.4000)
Syntax
| C# | 
|---|
public virtual Object GetIdOfOwnerOrNull( Object key, ISessionImplementor session )  | 
| Visual Basic | 
|---|
Public Overridable Function GetIdOfOwnerOrNull ( _ key As Object, _ session As ISessionImplementor _ ) As Object  | 
| Visual C++ | 
|---|
public: virtual Object^ GetIdOfOwnerOrNull( Object^ key, ISessionImplementor^ session )  | 
Parameters
- key
 - Type: System..::..Object
The collection owner key 
- session
 - Type: NHibernate.Engine..::..ISessionImplementor
The session from which the request is originating.