Sourcecode GM Shout von Csharp

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
namespace GMMessage
{
    class GMMessage
    {
        private Socket sock;
        private byte[] buffer;
        private IPAddress ip;
        private string msg;
        private System.Windows.Forms.TextBox textBox;
       
        public GMMessage(string IP)
        {
            this.ip = IPAddress.Parse(IP);
        }

        ~GMMessage()
        {
            this.sock.Close();
        }

        public void SendMessage(string message)
        {
            this.msg = message;

            IPEndPoint remoteEP = new IPEndPoint(this.ip, 9116); //OPTool => World Manager
            this.sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            this.sock.Connect(remoteEP);
            this.sock.BeginReceive(this.buffer = new byte[1], 0, 1, SocketFlags.None, new AsyncCallback(this.ParseHeader), this.sock);
        }

        private void ParseHeader(IAsyncResult result)
        {
            if (this.sock.EndReceive(result) > 0)
            {
                byte size = this.buffer[0];
                this.sock.BeginReceive(this.buffer = new byte[size], 0, size, SocketFlags.None, new AsyncCallback(this.ParseData), this.sock);
            }
            else
            {
                //failed :'<
                this.sock.Close();
            }
        }

        private void ParseData(IAsyncResult result)
        {
            if (this.sock.EndReceive(result) > 0)
            {
                switch (this.buffer[0])
                {
                    case 1:
                        this.sock.Send(new byte[] { 9, 2, 8, 0, 5, 8, 0, 0, 13, 0 }); //Handshake
                        goto case 2;

                    case 2:
                        this.sock.BeginReceive(this.buffer = new byte[1], 0, 1, SocketFlags.None, new AsyncCallback(this.ParseHeader), this.sock);
                        break;
                    case 3:
                        {
                            using (MemoryStream output = new MemoryStream())
                            {
                                using (BinaryWriter writer = new BinaryWriter(output))
                                {
                                    //Header
                                    writer.Write((byte)(this.msg.Length + 4));
                                    writer.Write((byte)16);
                                    writer.Write((byte)32);
                                    writer.Write((byte)60);
                                    //Body
                                    writer.Write(Encoding.ASCII.GetBytes(this.msg)); //Message
                                    //Footer
                                    writer.Write((byte)0);
                                    
                                    byte[] buffer = new byte[writer.BaseStream.Length];
                                    writer.BaseStream.Position = 0L;
                                    writer.BaseStream.Read(buffer, 0, (int)writer.BaseStream.Length);
                                    this.sock.Send(buffer);
                                    //done
                                }
                            }
                            goto case 2;
                        }
                }
            }
            else
            {
                this.sock.Close();
                return;
            }
        }
    }
}