title: How draw rectangle in millimeter
body: <pre><code>using (var mem = new MemoryStream())
  using (var bmp = new Bitmap(85, 54))
  using (var gfx = Graphics.FromImage((Image)bmp))
  {
      // gfx.SmoothingMode = SmoothingMode.AntiAlias;
      gfx.PageUnit = GraphicsUnit.Millimeter;
      gfx.FillRectangle(Brushes.Red, new Rectangle(0, 0, bmp.Width, bmp.Height));
  
      //add question
      gfx.DrawString(captcha, new Font("Arial", 5), Brushes.Blue, bmp.Width / 2, bmp.Height/2);
  
      //render as Jpeg
      bmp.Save(mem, System.Drawing.Imaging.ImageFormat.Jpeg);
      img = this.File(mem.GetBuffer(), "image/Jpeg");
  }
  
  return img;
  </code></pre>
  
  <p>this not work.
  I need 85x54   millimeter </p>
  
  <p>how do this?</p>
  
  <p><strong>I need draw for print</strong></p>