Problems with Delegates and Invoking

Question

I'm working on a port scanner that constantly displays the status of a game server, but for some reason I keep getting this error : http://i47.tinypic.com/vpgkl4.png

I'm pretty new to the c sharp language, and I've been looking around online about delegates, but I seem to have messed up somewhere after following an example.

Everything works fine until I decide to terminate my program, that's when the error comes up, and visual studio does not stop debugging and unlocking the source files automatically.(i have to hit ctrl+f5 manually). I'd be grateful if someone would point out my error(s).

using Microsoft.Win32;
using System;
using System.Diagnostics;
using System.IO;
using System.Net.Sockets;
using System.Threading;
using System.Windows.Forms;

namespace AfterPatch_SC__Launcher
{
    public partial class frm_StatusChecker : Form
    {
        Thread WorldServerStatusThread;

        public frm_StatusChecker()
        {
            InitializeComponent();
        }

        private void frm_StatusChecker_Load(object sender, EventArgs e)
        {
            this.WorldServerStatusThread = new Thread(new ThreadStart(this.WorldServerStatus));
            this.WorldServerStatusThread.Start();
        }

        delegate void SetTextCallback(string Text);
        private void WorldServerStatus()
        {
            while ( true )
            {
                try
                {
                    Thread.Sleep(1000);
                    TcpClient CheckWorldServer = new TcpClient();
                    CheckWorldServer.Connect("63.251.217.4", 8484);
                    if (this.label_WorldServerStatus.InvokeRequired)
                    {
                        SetTextCallback A1 = new SetTextCallback(SetText);
                        this.Invoke(A1, new object[] { "ONLINE" });
                    }
                    else
                    {
                        this.label_WorldServerStatus.Text = "ONLINE";
                    }
                }
                catch
                {
                    if (this.label_WorldServerStatus.InvokeRequired)
                    {
                        SetTextCallback A2 = new SetTextCallback(SetText1);
                        this.Invoke(A2, new object[] { "OFFLINE" });
                    }
                    else
                    {
                        this.label_WorldServerStatus.Text = "OFFLINE";
                    }
                }
            }
        }

        private void SetText(string StatusOnline)
        {
            this.label_WorldServerStatus.Text = "ONLINE";
        }

        private void SetText1(string StatusOffline)
        {
            this.label_WorldServerStatus.Text = "OFFLINE";
        }
    }
}

I apologize beforehand for how messy or nooby my coding may be..