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Код

public partial class Test : Form
    {

        DataGridView grid;
        Button buttonAdd;
        Button buttonEdit;

        public Test()
        {

            grid = new DataGridView();
            grid.Dock = DockStyle.Top;
            this.Controls.Add(this.grid);
            
            //  simple initialize
            Item.AddItem(new Item() { Name = "name", Value = 0 });

            this.grid.DataSource = new BindingList<Item>(Item.WorkedItems);

            this.buttonAdd = new Button();
            this.buttonAdd.Text = "Add";
            this.buttonAdd.Dock = DockStyle.Bottom;
            this.Controls.Add(this.buttonAdd);
            this.buttonAdd.Click += delegate
            {
                Item.AddItem(
                    new Item()
                    {
                        Name = "name" + Item.WorkedItems.Count,
                        Value = Item.WorkedItems.Count
                    });
                // Принудительное обновление
                CurrencyManager man = (CurrencyManager)this.grid.BindingContext[this.grid.DataSource];
                man.Refresh();
            };


            this.buttonEdit = new Button();
            this.buttonEdit.Text = "Edit";
            this.buttonEdit.Dock = DockStyle.Bottom;
            this.Controls.Add(this.buttonEdit);
            this.buttonEdit.Click += delegate
            {
                Item item = Item.WorkedItems[0];
                item.Value++;

                // Принудительное обновление
                //CurrencyManager man = (CurrencyManager)this.grid.BindingContext[this.grid.DataSource];
                //man.Refresh();
            };
        }

        class Item : INotifyPropertyChanging
        {
            string m_name;
            int m_value;
            public string Name 
            {
                get { return this.m_name; }
                set
                {
                    this.m_name = value;
                    if (PropertyChanging != null)
                        PropertyChanging(this, new PropertyChangingEventArgs("Name"));
                }
            }
            public int Value 
            {
                get { return this.m_value; }
                set
                {
                    this.m_value = value;
                    if (PropertyChanging != null)
                        PropertyChanging(this, new PropertyChangingEventArgs("Value"));
                }
            }


            static List<Item> s_workedItem;
            public static IList<Item> WorkedItems
            {
                get
                {
                    if (s_workedItem == null)
                    {
                        s_workedItem = new List<Item>();
                    }
                    return s_workedItem;
                }
            }
            public static void AddItem(Item item)
            {
                WorkedItems.Add(item);
            }


            #region INotifyPropertyChanging Members

            public event PropertyChangingEventHandler PropertyChanging;

            #endregion
        }
    }