BitServer.Program.checkMSG C# (CSharp) Method

        private static void checkMSG()
        {
            if (File.Exists("ack.txt"))
            {
                AckMessage.AddRange(File.ReadAllLines("ack.txt"));
            }
            cont = true;
            while (cont)
            {
                lock (AckMessage)
                {
                    for (int ii = 0; ii < AckMessage.Count; ii++)
                    {
                        string[] parts = AckMessage[ii].Split(new char[]{' '},2);
                        if (parts.Length > 1)
                        {
                            switch (BitAPIserver.BA.getStatus(parts[0]).ToLower().Trim())
                            {
                                case "notfound":
                                    adminMsg("ERR: Error sending message.",
                                        string.Format(@"Your Message '{0}' could not be sent.
            Status: notfound
            You probably tried to send a message to yourself or from an address that is not yours.
            It is also possible, that you deleted the message from the outbox.", parts[1]));
                                    AckMessage.RemoveAt(ii--);
                                    break;
                                case "broadcastsent":
                                    adminMsg("OK: Broadcast sent",
                                        string.Format("Your broadcast '{0}' was sent", parts[1]));
                                    AckMessage.RemoveAt(ii--);
                                    break;
                                case "msgsent":
                                    break;
                                case "ackreceived":
                                    adminMsg("OK: Message sent",
                                        string.Format("Your Message '{0}' was sent and reached its destination.", parts[1]));
                                    AckMessage.RemoveAt(ii--);
                                    break;
                                default:
                                    break;
                            }
                        }
                        else
                        {
                            AckMessage.RemoveAt(ii--);
                        }
                    }
                }
                for (int i = 0; i < 30 && cont; i++)
                {
                    Thread.Sleep(1000);
                }
                if (File.Exists("ack.txt"))
                {
                    File.Delete("ack.txt");
                }
                if (AckMessage.Count > 0)
                {
                    File.WriteAllLines("ack.txt", AckMessage.ToArray());
                }
            }
        }