title: Auto refresh image (without javascript, flash, silverlight)
body: <p>I would like to display an image that changes its content every 2 seconds (or something like that).
  Unfortunetly I can't use JavaScript, Flash or Silverlight because I want to use the animation in outgoing html emails with maximum compatibility between various email clients.</p>
  
  <p>So, I tried to generate the image with an .ashx handler. But I am not able to refresh the image (or re-execute the ashx handler). I tried a loop, but that didn't work.</p>
  
  <pre><code>    public void ProcessRequest(HttpContext context)
      {
          context.Response.ContentType = "image/png";
  
          string strDisplay = DateTime.Now.ToString();
  
          Bitmap bmpOut = new Bitmap(400, 50);
          Graphics g = Graphics.FromImage(bmpOut);
          g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
          g.FillRectangle(Brushes.Black, 0, 0, 400, 50);
          g.DrawString(strDisplay, new Font("Verdana", 18), new SolidBrush(Color.White), 0, 0);
  
          MemoryStream ms = new MemoryStream();
          bmpOut.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
          byte[] bmpBytes = ms.GetBuffer();
          bmpOut.Dispose();
          ms.Close();
  
          context.Response.BinaryWrite(bmpBytes);
          context.Response.End();
  
      }
  </code></pre>
  
  <p>How do I have to do this, or is there an other solution?</p>
  
  <p><strong>Edit:</strong> The image content is not predefined. It contains for example a list of tweets.</p>
  
  <p><strong>Edit:</strong> Currently we are trying MJPEG. Does anyone know more about this and email clients?</p>
  
  <p>Help much appreciated,</p>
  
  <p>Vincent</p>