C#

public class MyClass
{
    private DataTable _mainDataTable;
    private List<Item> _items;

    public class Item
    {
        public Item()
        {
        }
        public int Id { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public bool Enabled { get; set; }
    }

    private MyClass()
    {
    }

    public DataTable MainDataTable
    {
        get
        {
            if (_mainDataTable == null && _items != null)
                _mainDataTable = _items.ConvertToDataTable<Item>();
            return _mainDataTable;
        }
        set { _mainDataTable = value; }
    }
    public List<Item> Items
    {
        get
        {
            if (_items == null && _mainDataTable != null)
            {
                _items = _mainDataTable.ConvertToListOfItems<Item>();
            }
            return _items;
        }
        set { _items = value; }
    }
    public int CurrentItemIndex { get; set; }
    public Item CurrentItem
    {
        get
        {
            if (Items == null || Items.Count == 0 || CurrentItemIndex + 1 > Items.Count)
                return new Item();
            return Items[CurrentItemIndex];
        }
    }
}

Myclass obj=new Myclass();
int id=obj.CurrentItem.Id;

Myclass obj=new Myclass();
int id=obj.Id;