Фоновий процес

public Form1() { 

     InitializeComponent(); 

     backgroundWorker1.DoWork += backgroundWorker1_DoWork;     

     backgroundWorker1.ProgressChanged += backgroundWorker1_ProgressChanged;  

     backgroundWorker1.WorkerReportsProgress = true; 

} 

private void button1_Click(object sender, EventArgs e) 

{ 

     backgroundWorker1.RunWorkerAsync(); 

} 

private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) 

{ 

     for (int i = 0; i < 100; i++) { 

          Thread.Sleep(1000); 

          backgroundWorker1.ReportProgress(i); 

     } 

} 

private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) 

{ 

     progressBar1.Value = e.ProgressPercentage; 

}

        int i = 0;

        void AAA() {

            for (i = 0; i < 1000000; i++)

            {

                Thread.Sleep(2000);

            }

        }

        private void button1_Click(object sender, EventArgs e)

        {         

            new Thread(AAA) { IsBackground = true }.Start();         

        }

        private void timer1_Tick(object sender, EventArgs e)

        {

            this.Text = i.ToString();

        }