using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace EqTest
{
    public class Item
    {
        public int Id { get; set; }
        public string Title { get; set; }
        public string Desc { get; set; }
        public DateTime Published { get; set; }

        public Item()
        { }

        public Item(int id, string title, string desc, DateTime published)
        {
            this.Id = id;
            this.Title = title;
            this.Desc = desc;
            this.Published = published;
        }

        public override bool Equals(System.Object obj)
        {
            // If parameter is null return false.
            if (obj == null)
            {
                return false;
            }

            // If parameter cannot be cast to Point return false.
            Item item = obj as Item;
            if ((System.Object)item == null)
            {
                return false;
            }

            // Return true if the fields match:
            return (Title == item.Title) && (Desc == item.Title);
        }


    }
}

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace EqTest
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            List<Item> items1 = new List<Item>(); 
            List<Item> items2 = new List<Item>();
            items1.Add(new Item(1, "Professional ASP.NET 3.5", "McDonald", DateTime.Parse("01.01.2009")));
            items2.Add(new Item(1, "Beginner ASP.NET 3.5", "McDonald", DateTime.Parse("01.01.2009")));
            items2.Add(new Item(2, "Professional ASP.NET 3.5", "McDonald", DateTime.Parse("01.01.2009")));
            items2.Add(new Item(2, "Professional ASP.NET 3.5", "Esposito", DateTime.Parse("01.01.2009")));
            IEnumerable<Item> result = items2.Except(items1);
            GridView1.DataSource = result.ToList();
            DataBind();
        }
    }
}