Concurrent Bag

    [Serializable]
    public class ConcurrentList<T> : ConcurrentBag<T> //where T : ICloneable
    {
        private object lockObject = new object();

        public ConcurrentList<T> CloneOnlyList()
        {
            lock (lockObject)
            {
                ConcurrentList<T> clone = new ConcurrentList<T>();
                foreach (T t in this)
                {
                    clone.Add(t);
                }
                return clone;
            }
        }

        public T this[int i]
        {
            get
            {
                return this.ElementAt(i);
            }
        }

        public void Clear()
        {
            T someItem;
            lock (lockObject)
            {
                while (!this.IsEmpty)
                {
                    this.TryTake(out someItem);
                }
            }
        }
    }