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Код


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 WindowsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

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

        void InsertNumber()
        {
            for (int i = 0; i <= 10000; i++)
            {
                AddToList(i);
                ChangeLabel(i.ToString());
            }
        }

        delegate void AddToListD(int number);
        void AddToList(int number)
        {
            if (listBox1.InvokeRequired)
            {
                listBox1.BeginInvoke(new AddToListD(AddToList), new object[] {number});
            }
            else
            {
                listBox1.Items.Add(number);
            }
        }

        delegate void ChangeLabelD(string str);
        void ChangeLabel(string str)
        {
            if (label1.InvokeRequired)
            {
                label1.BeginInvoke(new ChangeLabelD(ChangeLabel), new object[] { str });
            }
            else
            {
                label1.Text = str;
            }
        }
    }
}

Код


        void InsertNumber()
        {
            for (int i = 0; i <= 5000; i++)
            {
                AddToList(i);
                ChangeLabel(i.ToString());
                Thread.Sleep(10);
            }
        }