what is the problem in this >>> see the code and pls help me

[C# Programming]

remoting dll >>>>
using System;
using System.Collections;
using System.Linq;
using System.Text;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;


namespace Remoting
{
public class ChatServer : MarshalByRefObject
{
ArrayList client = new ArrayList();

public void AddClient(string s)
{
client.Add(s);

}
public ArrayList AllClient()
{
return client;
}

}
}

Server code >>>>>>>>

using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;
using Remoting;

namespace Server
{
public partial class Form1 : Form
{
ChatServer server;
public Form1()
{
InitializeComponent();
HttpChannel ch = new HttpChannel(8080);
ChannelServices.RegisterChannel(ch, false);
RemotingConfiguration.RegisterWellKnownServiceType(typeof(ChatServer), "CS", WellKnownObjectMode.Singleton);


}

private void ShowClients_Click(object sender, EventArgs e)
{
server = new ChatServer();
ArrayList cn =server.AllClient();

foreach (string c in cn)
{
listBox1.Items.Add(c);
}


}
}
}

client code >>>>>

using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Http;
using Remoting;

namespace Client
{
public partial class Form1 : Form
{
ChatServer client;
public Form1()
{
InitializeComponent();
HttpChannel ch = new HttpChannel();
ChannelServices.RegisterChannel(ch, false);
RemotingConfiguration.RegisterWellKnownClientType(typeof(ChatServer), "http://localhost:8080/CS");
client = new ChatServer();
client.AddClient("AAA");
}
}
}


>>>>>>>>> when i click on showclient its not showing ........ what is the problem.

Thanks in Advance