ProgressBar

 private void button1_Click(object sender, EventArgs e)
        {
            progressBar1.Maximum = 100;
            progressBar1.Value = 0;
            progressBar1.Step = 5;
            for (int i = 0; i < 20; i++)
            {
                System.Threading.Thread.Sleep(1000);
                progressBar1.Value += progressBar1.Step;
            }
        }