Resize text size of a label when the text gets longer than the label size?

Question

I have a label that shows the file name .. I had to set AutoSize of the label to False for designing.
So when the file name text got longer tha

Answer 1

Based on the article provided by @brgerner, I'll provide the alternative implementation here, as that one marked as an answer is not so efficient nor complete as this one below:

public class FontWizard
{
    public static Font FlexFont(Graphics g, float minFontSize, float maxFontSize, Size layoutSize, string s, Font f, out SizeF extent)
    {
        if (maxFontSize == minFontSize)
            f = new Font(f.FontFamily, minFontSize, f.Style);

        extent = g.MeasureString(s, f);

        if (maxFontSize <= minFontSize)
            return f;

        float hRatio = layoutSize.Height / extent.Height;
        float wRatio = layoutSize.Width / extent.Width;
        float ratio = (hRatio < wRatio) ? hRatio : wRatio;

        float newSize = f.Size * ratio;

        if (newSize < minFontSize)
            newSize = minFontSize;
        else if (newSize > maxFontSize)
            newSize = maxFontSize;

        f = new Font(f.FontFamily, newSize, f.Style);
        extent = g.MeasureString(s, f);

        return f;
    }

    public static void OnPaint(object sender, PaintEventArgs e, string text)
    {
        var control = sender as Control;
        if (control == null)
            return;

        control.Text = string.Empty;    //delete old stuff
        var rectangle = control.ClientRectangle;

        using (Font f = new System.Drawing.Font("Microsoft Sans Serif", 20.25f, FontStyle.Bold))
        {
            SizeF size;
            using (Font f2 = FontWizard.FlexFont(e.Graphics, 5, 50, rectangle.Size, text, f, out size))
            {
                PointF p = new PointF((rectangle.Width - size.Width) / 2, (rectangle.Height - size.Height) / 2);
                e.Graphics.DrawString(text, f2, Brushes.Black, p);
            }
        }
    }
}

and the usage:

val label = new Label();
label.Paint += (sender, e) => FontWizard.OnPaint(sender, e, text);