class Program
    {
        static void Main(string[] args)
        {
            List<Entity> a = new List<Entity>();
            a.Add(new Entity { property = "0" });
            a.Add(new Entity { property = "1" });
            a.Add(new Entity { property = "2" });
            a.Add(new Entity { property = "3" });
            a.Add(new Entity { property = "4" });
            List<Entity> b = deepCopy(a);

        }

        public static List<Entity> deepCopy(List<Entity> list)
        {
            List<Entity> cList = new List<Entity>();
            foreach (var item in list)
            {
                Entity data = new Entity(item);
                cList.Add(data);
            }
            return cList;
        }

        public class Entity
        {
            public Entity(Entity item)
            {
                property = item.property;
            }

            public Entity()
            {
            }

            public string property { set; get; }
        }
    }