C#

namespace gcsc.Interface
{
    public interface IEditableObject
    {
        bool IsNew();

        void IsNew(bool status);

        bool IsDirty();

        void IsDirty(bool status);
    }
}

namespace gcsc.UI
{
    public abstract class EditableObject : Interface.IEditableObject
    {
        private bool _isNew;
        private bool _isDirty;

        public bool IsNew()
        {
            return _isNew;
        }

        public void IsNew(bool status)
        {
            _isNew = status;
        }

        public bool IsDirty()
        {
            return _isDirty;
        }

        public void IsDirty(bool status)
        {
            _isDirty = status;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using GI = gcsc.Interface;

namespace gcsc.Util
{
    public sealed class GCSCBindingList<T> : BindingList<T>
    {
        private readonly List<T> _removeItems;
        private readonly bool _initValues;

        public IEnumerable<T> GetRemovedItems()
        {
            return _removeItems.AsEnumerable();
        }

        public IEnumerable<T> GetUpdatedItems()
        {
            foreach (GI.IEditableObject item in this)
            {
                if (item.IsDirty())
                    yield return (T)item;
            }
        }

        public IEnumerable<T> GetNewItems()
        {
            foreach (GI.IEditableObject item in this)
            {
                if (item.IsNew())
                    yield return (T)item;
            }
        }

        public GCSCBindingList()
        {
            if (!typeof(T).ImplementsInterface<GI.IEditableObject>())
                throw new ArrayTypeMismatchException("T must implement gcsc.Interface.IEditableObject");

            _removeItems = new List<T>();

            AllowEdit = true;
            AllowNew = true;
            AllowRemove = true;
        }

        public GCSCBindingList(IList<T> list)
        {
            if (!typeof(T).ImplementsInterface<GI.IEditableObject>())
                throw new ArrayTypeMismatchException("T must implement gcsc.Interface.IEditableObject");

            _removeItems = new List<T>();

            AllowEdit = true;
            AllowNew = true;
            AllowRemove = true;

            _initValues = true;

            foreach (var v in list)
                base.Add(v);

            _initValues = false;
        }

        protected override void InsertItem(int index, T item)
        {
            if (!_initValues)
                ((GI.IEditableObject)item).IsNew(true);
            base.InsertItem(index, item);
        }

        public new void Insert(int index, T item)
        {
            ((GI.IEditableObject)item).IsNew(true);
            base.Insert(index, item);
        }

        protected override void RemoveItem(int index)
        {
            if (index >= 0 && index < base.Count)
            {
                var item = base[index];
                _removeItems.Add(item);
                base.RemoveItem(index);
            }
        }
    }
}

Now with the GCSCBindingList<T>

i can retrieve all deleted items and all the new items, but still i cant find a way to collect all edited items.

the IsDirty(bool status) method should set to true if the item has been modified, but i cant find the way to implement this.

Could you help me do this?

this is my sample usage, first the class

public class person : gcsc.UI.EditableObject
    {
        public person()
        {
        }

        public person(string lastname, string firstname)
        {
            LastName = lastname;
            FirstName = firstname;
        }

        public override string ToString()
        {
            return string.Format("{0}, {1} status new:{2}, dirty:{3}", LastName, FirstName, IsNew(), IsDirty());
        }

        public string FirstName { get; set; }

        public string LastName { get; set; }
    }

List<person> p = new List<person>();
p.Add(new person("John", "smith"));
p.Add(new person("pual", "carl"));

GB = new gcsc.Util.GCSCBindingList<person>(p);

private void simpleButton1_Click(object sender, EventArgs e)
        {

            GB.RemoveAt(0);

            foreach (person p in GB.GetNewItems())
            {
                XtraMessageBox.Show(p.ToString());
            }

            foreach (person p in GB.GetRemovedItems())
            {
                XtraMessageBox.Show(p.ToString());
            }

            foreach (person p in GB.GetUpdatedItems())
            {
                MessageBox.Show(p.ToString());
            }
        }