Maintaining a two way relationship between classes

Question

It is pretty common, especially in applications with an ORM, to have a two way mapping between classes. Like this:

public class Product
{
    private List

        

Answer 1

In the past, I've done something like this when I needed to maintain this type of relationship...

public class Owner
{
    public List OwnedList { get; set; }
}

public class Owned
{
    private Owner _owner;

    public Owner ParentOwner
    {
        get
        {
            if ( _owner == null )
                _owner = GetParentOwner(); // GetParentOwner() can be any method for getting the parent object
            return _owner;
        }
    }
}