New Post: Composing inter-dependant objects

For any of those that are interested, I ended up creating an interface IRequireSession which has the following declaration

    public interface IRequireSession
    {
        ISession Session { get; set; }
    }

And is implemented in a Form base class :

    public class DataForm : Form, IRequireSession
    {
        private ISession _session;

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [Import()]
        public ISession Session
        {
            get { return _session; }
            set { 
                _session = value;
                SetSession(this.Controls);
            }
        }

        private void SetSession(Control.ControlCollection controls)
        {
            foreach (Control control in controls)
            {
                if (control is IRequireSession)
                    ((IRequireSession)control).Session = _session;
                SetSession(control.Controls);
            }
        }
    }

This means that I can derive my normal forms from DataForm and get the session passed through to any user controls that implement IRequireSession. Although, I've got a funny feeling that MEF doesn't support attributes on base classes. . I guess I'll find out soon enough.