public void HandleNewChunkHash(C2SMessageReader mr)
        {
            if (!ServerCommunicationCenter.commCenter.ClientsEndPoint.ContainsKey(mr.ClientEP()))
            {
                return;
            }
            ChunkHash ch = mr.ReadChunkHash();
            int       id = mr.ReadRegisteringFileId();

            Debug.WriteLine("hash for:" + id);
            if (!ServerObjectGraph.sog.FileRegistrations.ContainsKey(id))
            {
                return;
            }
            ServerObjectGraph.sog.FileRegistrations[id].HashArrived(ch);
        }