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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace DelegateTest
{
    public partial class Form1 : Form
    {
        delegate void TextUpdate1(string text1);
        private bool running = true;
        
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
                Thread f = new Thread(new ThreadStart(funk));
                f.Start();
        }

        private void funk()
        {
            for (int i=0; i<1000; i++)
            {
                     if (textBox1.InvokeRequired)
                    {
                        TextUpdate1 gg = new TextUpdate1(settext);
                        Invoke(gg, new object[] { i.ToString() });
                        Thread.Sleep(10);
                    }
                    else
                        textBox1.Text = i.ToString();
                             
            }
        }
        private void settext(string text1)
        {
            textBox1.Text = text1;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            textBox2.Text = textBox2.Text + "d";
        }
    }
}					

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protected override void OnClosed(EventArgs e)
    {
        // hier den Thread beenden
        ...

        base.OnClosed(e);
    }