Server - Code for Messenger

using System.IO;
using System.Net;
using System;
using System.Threading;
using N = System.Net;
using System.Data;
using System.Collections;
using System.Windows;
using System.Runtime;
using System.ComponentModel;
using System.Globalization;
using System.Configuration;
using System.Windows.Forms;
using System.Net.Sockets;
using System.Runtime.InteropServices;


namespace Server
{
public partial class Form1 : Form
{
static N.Sockets.TcpClient TC;
[DllImport("kernel32.dll")]
private static extern void ExitProcess(int a);
public Form1()
{
InitializeComponent();
}
System.Net.Sockets.TcpListener server;
public static Hashtable handles;
public static Hashtable handleByConnect;
IPAddress ip;
Boolean asss;
public void TalkServ()
{
asss = true;
ip = IPAddress.Parse("192.168.3.200");
handles = new Hashtable(100);
handleByConnect = new Hashtable(100);
server = new TcpListener(ip,13000);
while(true)
{
server.Start();
if(server.Pending())
{
N.Sockets.TcpClient connection = server.AcceptTcpClient();
MessageBox.Show("Connection Made");
BackForth BF = new BackForth(connection);
}
server.Stop();
}
}
public static void SendToAll(string name, string msg)
{

StreamWriter SW;
ArrayList ToRemove = new ArrayList(0);
N.Sockets.TcpClient[] tc = new N.Sockets.TcpClient[handles.Count];
handles.Values.CopyTo(tc, 0);
for (int i = 0; i < tc.Length; i++)
{
try
{
if (msg.Trim() == "" || tc[i] == null)
continue;
SW = new StreamWriter(tc[i].GetStream());
SW.WriteLine(name + ": " + msg);
SW.Flush();
SW = null;
}
catch (Exception)
{
//e44 = e44;
string g = (string)handleByConnect[tc[i]];
SendSysMsg("** " + g + " ** HAS LEFT US.");
handles.Remove(g);
handleByConnect.Remove(tc[i]);
}
}
}
public static void SendSysMsg(string msg)
{
StreamWriter SW;
ArrayList ToRemove = new ArrayList(0);
N.Sockets.TcpClient[] tc = new N.Sockets.TcpClient[handles.Count];
handles.Values.CopyTo(tc, 0);
for (int i = 0; i < tc.Length; i++)
{
try
{
if (msg.Trim() == "" || tc[i] == null)
continue;
SW = new StreamWriter(tc[i].GetStream());
SW.WriteLine(msg);
SW.Flush();
SW = null;
}
catch (Exception)
{
handles.Remove(handleByConnect[tc[i]]);
handleByConnect.Remove(tc[i]);
}
}
}

private static void talk_Closing(object s, CancelEventArgs e)
{
e.Cancel = false;
Application.Exit();
ExitProcess(0);
}
private static void key_up(object s, KeyEventArgs e)
{
TextBox TB = (TextBox)s;
if (TB.Lines.Length > 1)
{
StreamWriter SW = new StreamWriter(TC.GetStream());
SW.WriteLine(TB.Text);
SW.Flush();
TB.Text = " ";
TB.Lines = null;
}
}

private void Form1_Load_1(object sender, EventArgs e)
{
TalkServ();
}
}

class BackForth
{
N.Sockets.TcpClient client;
System.IO.StreamReader SR;
System.IO.StreamWriter SW;
public string handle;

public BackForth(System.Net.Sockets.TcpClient c)
{
client = c;
Thread t = new Thread(new ThreadStart(init));
t.Start();
}

private string GetHandle()
{
SW.WriteLine("What is your Name? ");
SW.Flush();
return SR.ReadLine();
}

public void run()
{
try
{
string l = " ";
while (true)
{
l = SR.ReadLine();
Form1.SendToAll(handle, l);
}
}
catch (Exception e44)
{
MessageBox.Show(e44.ToString());
}
}

public void init()
{
SR = new System.IO.StreamReader(client.GetStream());
SW = new System.IO.StreamWriter(client.GetStream());
SW.WriteLine("WELCOME TO ChatOffice! Be Nice!");
SW.WriteLine("What is your Name? ");
SW.Flush();
handle = GetHandle();
while (Form1.handles.Contains(handle))
{
SW.WriteLine("ERR - Name already exists!");
handle = GetHandle();
}
Form1.handles.Add(handle, client);
Form1.handleByConnect.Add(client, handle);
Form1.SendSysMsg("** " + handle + " ** HAS JOINED US.");
SW.WriteLine("Now Talking.....\r\n-------------------------------");
SW.Flush();
Thread t = new Thread(new ThreadStart(run));
t.Start();
}
}
}