public void HandleFileClientListRequest(C2SMessageReader mr)
        {
            if (!ServerCommunicationCenter.commCenter.ClientsEndPoint.ContainsKey(mr.ClientEP()))
            {
                return;
            }
            int        fileId     = mr.ReadFileId();
            List <int> clientList = File.GetFileOwnersId(mr.ReadFileId());

            clientList.Remove(mr.ClientEP());
            ServerMessageProvider smp = new ServerMessageProvider(SocketResourcesManager.srm.ProvideBuffer());
            OutputMessage         om  = smp.ProvideClientListMessage(fileId, clientList);

            ServerCommunicationCenter.commCenter.SendMessageTo(mr.ClientEP(), om);
        }