C# PercentProgressBar

public class PercentProgressBar : ProgressBar
{
    public PercentProgressBar()
    {

        base.SetStyle(ControlStyles.UserPaint |
            ControlStyles.AllPaintingInWmPaint |
            ControlStyles.OptimizedDoubleBuffer, true);
    }

    protected override void OnPaint(PaintEventArgs e)
    {

        ProgressBarRenderer.DrawHorizontalBar(e.Graphics, this.ClientRectangle);


        double percent = (double)(this.Value - this.Minimum)
            / (double)(this.Maximum - this.Minimum);
        int chunksWidth = (int)((double)(this.ClientSize.Width - 2) * percent);
        Rectangle chunksRect = new Rectangle(1, 1,
            chunksWidth, this.ClientSize.Height - 2);

        ProgressBarRenderer.DrawHorizontalChunks(e.Graphics, chunksRect);


        string displayText = string.Format("{0}%", (int)(percent * 100.0));

        TextFormatFlags tff = TextFormatFlags.HorizontalCenter |
            TextFormatFlags.VerticalCenter |
            TextFormatFlags.SingleLine;
        TextRenderer.DrawText(e.Graphics, displayText, this.Font,
            this.ClientRectangle, SystemColors.ControlText, tff);
    }
}