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

Label scaling

private void scaleFont(Label lab)
{
    Image fakeImage = new Bitmap(1, 1); //As we cannot use CreateGraphics() in a class library, so the fake image is used to load the Graphics.
    Graphics graphics = Graphics.FromImage(fakeImage);

    SizeF extent = graphics.MeasureString(lab.Text, lab.Font);

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

    float newSize = lab.Font.Size * ratio;

    lab.Font = new Font(lab.Font.FontFamily, newSize, lab.Font.Style);
}

TextRenderer Approach pointed out by @ToolmakerSteve in the comments

private void ScaleFont(Label lab)
{
    SizeF extent = TextRenderer.MeasureText(lab.Text, lab.Font);

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

    float newSize = lab.Font.Size * ratio;

    lab.Font = new Font(lab.Font.FontFamily, newSize, lab.Font.Style);
}