private void button1_Click(object sender, EventArgs e)
        {
            progressBar1.Minimum = 0;
            // Sets the progress bar's maximum value to a number representing
            // all operations complete -- in this case, all five files read.
            progressBar1.Maximum = 500;
            // Sets the Step property to amount to increase with each iteration.
            // In this case, it will increase by one with every file read.
            progressBar1.Step = 1;

            // Uses a for loop to iterate through the operations to be
            // completed. In this case, five files are to be copied into memory,
            // so the loop will execute 5 times.
            for (int i = 0; i <= 500; i++)
            {
                // Inserts code to copy a file
                progressBar1.PerformStep();
                if (i <= 200)
                {
                    // Updates the label to show that a file was read.
                    label1.Text = "reading tools";
                }
                else if (i <= 499)
                {
                    label1.Text = "exporting files";
                }
                else
                {
                    label1.Text = "finished";
                }
            }
        }