C#

public interface IMyCollectionItem<T> {
   public MyCollection<T> Owner { set; }
}

public class MyCollection<T> where T : IMyCollectionItem {
   private List<T> list;
   public MyCollection() {
      this.list = new List<T>();
   }
   public override void Add(IMyCollectionItem item) {
      item.Owner = this;
      this.list.Add(item);
   }
}

public class PersonItem : IMyCollectionItem<PersonItem> {
   private MyCollection<PersonItem> owner;
   public MyCollection<PersonItem> Onwer { set { this.owner = value; } }
}

string[] files =
  Directory.GetFiles (rootDir, "cover.jpg",
                      SearchOption.AllDirectories);

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delegate void Func();
...
public string MessageText
{
    get
    {
        return label1.Text;
    }
    set
    {
        Func del = delegate
        {
            label1.Text = value;
        };

        Invoke(del);
    }
}

Btree myBtree = new Btree(this);

public Btree(Form1 frm)
{
    frm.MessageText = "This is a test";
}