OpenMetaverse.Simulator.SendPing C# (CSharp) Method

        public void SendPing()
        {
            uint oldestUnacked = 0;

            // Get the oldest NeedAck value, the first entry in the sorted dictionary
            lock (NeedAck)
            {
                if (NeedAck.Count > 0)
                {
                    SortedDictionary<uint, NetworkManager.OutgoingPacket>.KeyCollection.Enumerator en = NeedAck.Keys.GetEnumerator();
                    en.MoveNext();
                    oldestUnacked = en.Current;
                }
            }

            //if (oldestUnacked != 0)
            //    Logger.DebugLog("Sending ping with oldestUnacked=" + oldestUnacked);

            StartPingCheckPacket ping = new StartPingCheckPacket();
            ping.PingID.PingID = Stats.LastPingID++;
            ping.PingID.OldestUnacked = oldestUnacked;
            ping.Header.Reliable = false;
            SendPacket(ping, true);
            Stats.LastPingSent = Environment.TickCount;
        }