using System;
using System.ComponentModel;
using System.Windows.Forms;

namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        WorkLongTime wlt;
        public Form1()
        {
            InitializeComponent();
            wlt = new WorkLongTime();
            wlt.Changed += new ChangedEventHandler(wlt_Changed);
        }

        void wlt_Changed(object sender, EventArgs e)
        {
            progressBar1.Value++;
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            wlt.WorkLong();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Text = "Started...";
            backgroundWorker1.RunWorkerAsync();
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.Text = "Done";
        }
    }
}