أرجو توضيح ما الخطأ في هذا الكود

أرجو توضيح ما الخطاء في هذا الكود المكتوب بالأحمر فقط

حيث أني إحترت ولم أعرف السبب الحقيقي للخطأ في هذا الكود

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Threading;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.IO;

namespace TCPIP_Server_Simple_C_Sharpe
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
  private ArrayList alSockets;
  private System.Windows.Forms.Label lblStatus;
  private System.Windows.Forms.ListBox lbConnections;
  /// <summary>
  /// Required designer variable.
  /// </summary>
  private System.ComponentModel.Container components = null;

  public Form1()
  {
 	 //
 	 // Required for Windows Form Designer support
 	 //
 	 InitializeComponent();

 	 //
 	 // TODO: Add any constructor code after InitializeComponent call
 	 //
  }

  /// <summary>
  /// Clean up any resources being used.
  /// </summary>
  protected override void Dispose( bool disposing )
  {
 	 if( disposing )
 	 {
    if (components != null) 
    {
   	 components.Dispose();
    }
 	 }
 	 base.Dispose( disposing );
  }

  #region Windows Form Designer generated code
  /// <summary>
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// </summary>
  private void InitializeComponent()
  {
 	 this.lblStatus = new System.Windows.Forms.Label();
 	 this.lbConnections = new System.Windows.Forms.ListBox();
 	 this.SuspendLayout();
 	 // 
 	 // lblStatus
 	 // 
 	 this.lblStatus.Font = new System.Drawing.Font("Microsoft Sans Serif", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(178)));
 	 this.lblStatus.Location = new System.Drawing.Point(8, 24);
 	 this.lblStatus.Name = "lblStatus";
 	 this.lblStatus.Size = new System.Drawing.Size(104, 24);
 	 this.lblStatus.TabIndex = 0;
 	 this.lblStatus.Text = "My IP  adress is:- ";
 	 // 
 	 // lbConnections
 	 // 
 	 this.lbConnections.Location = new System.Drawing.Point(0, 56);
 	 this.lbConnections.Name = "lbConnections";
 	 this.lbConnections.Size = new System.Drawing.Size(288, 199);
 	 this.lbConnections.TabIndex = 1;
 	 // 
 	 // Form1
 	 // 
 	 this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
 	 this.ClientSize = new System.Drawing.Size(292, 266);
 	 this.Controls.Add(this.lbConnections);
 	 this.Controls.Add(this.lblStatus);
 	 this.Name = "Form1";
 	 this.Text = "TCP Server C#";
 	 this.Load += new System.EventHandler(this.Form1_Load);
 	 this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// The main entry point for the application.
  /// </summary>
  [STAThread]
  static void Main() 
  {
 	 Application.Run(new Form1());
  }

  private void Form1_Load(object sender, System.EventArgs e)
  {
 	 IPHostEntry IPHost = Dns.GetHostByName(Dns.GetHostName());
 	 lblStatus.Text = "My IP address is " +
    IPHost.AddressList[0].ToString();
 	 alSockets = new ArrayList();
 	 Thread thdListener = new Thread(new
    ThreadStart(listenerThread));
 	 thdListener.Start();
  }

  
	}
}

public void listenerThread()
{
TcpListener tcpListener = new TcpListener(8080);
tcpListener.Start();
while(true)
{
Socket handlerSocket = tcpListener.AcceptSocket();
if (handlerSocket.Connected)
{
lbConnections.Items.Add(handlerSocket.RemoteEndPoint.ToString() + " connected.");
lock (this)
{
alSockets.Add(handlerSocket);
}
ThreadStart thdstHandler = newThreadStart(handlerThread);
Thread thdHandler = new Thread(thdstHandler);
thdHandler.Start();

}
}
}
new TcpListener(IPAddress.Any,8080)

public void handlerThread()
{
Socket handlerSocket = (Socket)alSockets[alSockets.Count-1];
NetworkStream networkStream = new
NetworkStream(handlerSocket);
int thisRead=0;
int blockSize=1024;
Byte[] dataByte = new Byte[blockSize];
lock(this)
{
// Only one process can access
// the same file at any given time
Stream fileStream = File.OpenWrite("c:\\my documents\\upload.txt");
while(true)
{
thisRead=networkStream.Read(dataByte,0,blockSize);
fileStream.Write(dataByte,0,thisRead);
if (thisRead==0) break;
}
fileStream.Close();
}
lbConnections.Items.Add("File Written");
handlerSocket = null;
}
}
}
}
}
}