Locking problem

                    case "tag":
                        lock (ticketlist.Tickets)
                        {
                            try
                            {
                                string[] officialtags = File.ReadAllText(tagpath).Split('\n');
                                for (int i = 0; i < officialtags.Length; i++)
                                {
                                    officialtags[i] = officialtags[i].Trim().ToLower();
                                }
                                if (!((IList<string>)officialtags).Contains(args.Parameters[1].Trim().ToLower()))
                                {
                                    args.Player.SendMessage("Tag does not exist.", Color.Red);
                                    return;
                                }
                                for (int i = 0; i < ticketlist.Tickets.Count; i++)
                                {
                                    if (ticketlist.Tickets[i].getTag().Trim().ToLower() == args.Parameters[1].Trim().ToLower())
                                    {
                                        ticketlist.Tickets.RemoveAt(i);
                                    }
                                }
                            }
                            catch (Exception e)
                            {
                                args.Player.SendMessage("Error, could not clear tickets, check log for more info.", Color.Red);
                                Log.Error(e.Message);
                            }
                            finally { args.Player.SendMessage("All tickets with the tag \"" + args.Parameters[1] + "\" cleared.", bluebase); }
                        }
                        break;