Generic Solution Framework to Saving History of Records Using MSSQL Server 2005 Xml Column

using System;
using System.Text;
using System.Reflection;
using System.Collections;
using System.ComponentModel;
using System.Runtime.InteropServices;

namespace ConHist
{
    public class CellCollection : CollectionBase, ICustomTypeDescriptor
    {
        #region collection impl
        public void Add(Cell c)
        {
            this.List.Add(c);
        }

        public void Remove(Cell c)
        {
            this.List.Remove(c);
        }

        public Cell this[int index]
        {
            get
            {
                return (Cell )this.List[index];
            }
        }

        #endregion

        // Implementation of interface ICustomTypeDescriptor 
        #region ICustomTypeDescriptor impl

        public String GetClassName()
        {
            return TypeDescriptor.GetClassName(this, true);
        }

        public AttributeCollection GetAttributes()
        {
            return TypeDescriptor.GetAttributes(this, true);
        }

        public String GetComponentName()
        {
            return TypeDescriptor.GetComponentName(this, true);
        }

        public TypeConverter GetConverter()
        {
            return TypeDescriptor.GetConverter(this, true);
        }

        public EventDescriptor GetDefaultEvent()
        {
            return TypeDescriptor.GetDefaultEvent(this, true);
        }

        public PropertyDescriptor GetDefaultProperty()
        {
            return TypeDescriptor.GetDefaultProperty(this, true);
        }

        public object GetEditor(Type editorBaseType)
        {
            return TypeDescriptor.GetEditor(this, editorBaseType, true);
        }

        public EventDescriptorCollection GetEvents(Attribute[] attributes)
        {
            return TypeDescriptor.GetEvents(this, attributes, true);
        }

        public EventDescriptorCollection GetEvents()
        {
            return TypeDescriptor.GetEvents(this, true);
        }

        public object GetPropertyOwner(PropertyDescriptor pd)
        {
            return this;
        }

        public PropertyDescriptorCollection GetProperties(Attribute[] attributes)
        {
            return GetProperties();
        }

        public PropertyDescriptorCollection GetProperties()
        {
            PropertyDescriptorCollection pds = new PropertyDescriptorCollection(null);

            for (int i = 0; i < this.List.Count; i++)
            {
                CellCollectionPropertyDescriptor pd = new CellCollectionPropertyDescriptor(this, i);
                pds.Add(pd);
            }
            return pds;
        }
        #endregion        
    }
}