ZUpload - The new version

using PlayerIOClient;
using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;

namespace ZumzaUpload {
    class Program {
        static void Main(string[] args) {
            string email, password, worldId;
            Client client; Connection connection;
            Console.Write("Your email: "); email = Console.ReadLine();
            Console.Write("Your supercalifragilisticexpialidocious password: "); password = Console.ReadLine();
            Console.Write("Your world id: "); worldId = Console.ReadLine();
            client = PlayerIO.QuickConnect.SimpleConnect("everybody-edits-su9rn58o40itdbnw69plyw", email, password, null);
            connection = client.Multiplayer.JoinRoom(worldId, null);
            var uploadTest = new UploadTest(connection);
            connection.Send("init");
            connection.OnMessage += delegate (Object s, Message m) {
                if(m.Type == "init") {
                    connection.Send("init2");
                    (new UploadTest(connection)).Test();
                }
            };
            Console.ReadKey();
        }
    }

    class UploadTest : UploadTestBase {
        private List<int>[,] world = new List<int>[60, 100];
        private volatile String key;
        private Connection connection;

        public UploadTest(Connection connection) : base(connection) {
            for (var i = 0; i < world.GetLength(0); i++)
                for (var j = 0; j < world.GetLength(1); j++)
                    world[i, j] = new List<int>();
            this.connection = connection;
            connection.Send("init");
            connection.OnMessage += delegate (Object s, Message m) {
                if (m.Type == "init") {
                    connection.Send("init2");
                    key = derot(m.GetString(5));
                    base.Test();
                } else if (m.Type == "b") {
                    try {
                        if (world[m.GetInt(1), m.GetInt(2)].Contains(m.GetInt(3))) { // Is this really the block which we are looking for?
                            blocksToPlace--;
                            calculateTime();
                            world[m.GetInt(1), m.GetInt(2)].Remove(m.GetInt(3));
                        }
                    } catch (ArgumentOutOfRangeException) { }
                }
            };
        }

        private string derot(string EncryptedKey) {
            int c = 0;
            string key = "";
            for (int i = 0; i < EncryptedKey.Length; i++) {
                c = EncryptedKey[i];
                if (c >= 'a' && c <= 'z') {
                    if (c > 'm')
                        c -= 13;
                    else
                        c += 13;
                } else if (c >= 'A' && c <= 'Z') {
                    if (c > 'M')
                        c -= 13;
                    else
                        c += 13;
                }
                key = key + (char)c;
            }
            return key;
        }

        private DateTime lastTime;
        private volatile uint placingTime;
        private uint timeSum = 0;

        private void calculateTime() { //Top speed permited by police?
            timeSum += (uint) (DateTime.Now - lastTime).Milliseconds;
            placingTime = timeSum / (totalBlocks - blocksToPlace);
            lastTime = DateTime.Now;
        }

        private volatile bool placing = false;
        private volatile uint blocksToPlace = 0;
        private uint totalBlocks = 0;

        protected override void Upload(int layer, int x, int y, int block) {
            world[x, y].Add(block);
            blocksToPlace++; totalBlocks = blocksToPlace;
            if(!placing) {
                placing = true;
                Task.Factory.StartNew(() => {
                    lastTime = DateTime.Now;
                    placingTime = 8;
                    do {
                        for (var i = 0; i < world.GetLength(0); i++)
                            for (var j = 0; j < world.GetLength(1); j++) {
                                if (world[i, j].Count > 0) {
                                    while (key == null) ;
                                    connection.Send(key, 0, i, j, world[i, j][0]);
                                    Thread.Sleep((int)placingTime / 2); // its a street with 2 bands, right?
                                }
                            }
                    } while (blocksToPlace > 0);
                    placing = false;
                    base.Check();
                });
            }
        }
    }
}