C#

private Queue<NextDataReply> packs;
private bool productionDone;

private void Enqueue(NextDataReply pack)
{
    lock (packs)
    {
        packs.Enqueue(pack);
        // Notify all threads that a new pack was enqueued
        Monitor.PulseAll(packs);
    }
}

public NextDataReply Dequeue()
{
    lock (packs)
    {
        while (packs.Count == 0 && !productionDone)
            Monitor.Wait(packs);

        // If no more data should be queued for the current item being transfered, no dequeuing is possible
        if (productionDone) return null;

        return packs.Dequeue();
    }
}

public class MyCollectionName : IEnumerable
{
     List<string> m_Collection = new List<string>();
     // Some methods here
     
     public int Count
     {
         get { return m_Collection.Count; }
     }
     
     public IEnumerator GetEnumerator()
     {
          return m_Collection.GetEnumerator();
     }
}

for(int i = 0; i < myCollectionInstance.Count; i++)
{
    // And here use my collection as array
    myCollectionInstance[i];
}