Inherited interface and Bindinglist   

Hi All,
I am using a generic Bindinglist .
The class type of the objects in the generic list is derived from a base 
class.
This baseclass implements three properties of the base interface.
The derived class implements two more properties from the derived interface 
which inherits from the base interface.

These objects are added to a generic list.
This list is fed to a generic binding list.
This generic bindinglist is set as the datasource for a datagridview control.

The propblem is that the datagridview only displays the properties from the 
derived interface and not the properties from the base interface. Is this a 
bug or how can i fix this.


   public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<IDerivedInterface> lst = new List<IDerivedInterface>();
            for (int i = 0; i < 20; i++) {
                lst.Add(new DerivedClass());
            }
            BindingList<IDerivedInterface> dataSource = new    
BindingList<IDerivedInterface>(lst);
            dataGridView1.DataSource = dataSource;
        }
    }
    public interface IBaseInterface
    {
        string PropertyNameA { get;set;}
        string PropertyNameB { get;set;}
        string PropertyNameC { get;set;}

    }
    public interface IDerivedInterface 
    {
        string PropertyNameD { get;set;}
        string PropertyNameE { get;set;}
    }
    public class BaseClass : IBaseInterface
    {

        public BaseClass()
        {

        }

        #region IBaseInterface Members

        public string PropertyNameA
        {
            get { return "PropertyNameA"; }
            set { ;; }
        }

        public string PropertyNameB
        {
            get { return "PropertyNameB"; }
            set { ;; }
        }

        public string PropertyNameC
        {
            get { return "PropertyNameC"; }
            set { ;; }
        }

        #endregion
    }
    public class DerivedClass : BaseClass, IDerivedInterface
    {

        public DerivedClass()
        {

        }

        #region IDerivedInterface Members

        public string PropertyNameD
        {
            get { return "PropertyNameD"; }
            set { ;; }
        }

        public string PropertyNameE
        {
            get { return "PropertyNameE"; }
            set { ;; }
        }

        #endregion
    }
Best regards,
Hans

date: Tue, 26 Aug 2008 04:48:01 -0700   author:   Hans Bertram Hans