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

namespace Forms_Threading
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private int max = 10000;

        private void fkt1()
        {
            MethodInvoker m1 = delegate
            {
                for (int j = 0; j <= max; j++)
                {
                    textBox1.Text = j.ToString();               
                    textBox1.Refresh();                    
                }
            };

            Invoke(m1);
        }

        private void fkt2()
        {
            MethodInvoker m2 = delegate
            {
                for (int i = 0; i <= max; i++)
                {
                    textBox2.Text = i.ToString();
                    textBox2.Refresh();
                }
            };

            Invoke(m2);                       
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "";
            textBox2.Text = "";

           
            Thread t1 = new Thread(fkt1);
            Thread t2 = new Thread(fkt2);
            t1.IsBackground = true;
            t2.IsBackground = true;
            t1.Start();
            t2.Start();                    
        }
    }
}                    

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private void button2_Click(object sender, EventArgs e)
{
    int zahl = Convert.ToInt32(textBox3.Text) + 1;
    textBox3.Text = zahl.ToString();
}