Adding a watermark to a PDF file

   //Create AnnBatesStamp and set its properties
   AnnBatesStamp batesStamp = new AnnBatesStamp();
   batesStamp.Font = new AnnFont("Arial", 12);
   batesStamp.Foreground = AnnSolidColorBrush.Create("Red");
   batesStamp.HorizontalAlignment = AnnHorizontalAlignment.Center;
   batesStamp.VerticalAlignment = AnnVerticalAlignment.Center;
   batesStamp.Logo.Angle = 45;
   batesStamp.Logo.Font = new AnnFont("Arial", 14);
   batesStamp.Logo.Opacity = 0.5;
   batesStamp.Logo.StretchLogo = true;
   batesStamp.Logo.Picture = new AnnPicture(Path.Combine(ImagesPath.Path, "cannon.jpg"));
   //Add some elements to Bates stamp elements list
   batesStamp.Elements.Add(new AnnBatesNumber());
   batesStamp.Elements.Add(AnnBatesText.Create(" "));
   batesStamp.Elements.Add(new AnnBatesDateTime());
   batesStamp.Elements.Add(AnnBatesText.Create(" This is text element"));

   //Create AnnBatesStampComposer instance and add the created Bates stamp to it
   AnnBatesStampComposer batesStampComposer = new AnnBatesStampComposer();
   //Set the rendering engine
   AnnBatesStampComposer.RenderingEngine = new AnnWinFormsRenderingEngine();
   batesStampComposer.Stamps.Add(batesStamp);

   //Use the main automation object for your application instead of _automation we used here
   AnnAutomation automation = _automation;
   AnnContainer mainContainer = automation.Container;

   //Create Bates stamp container, set its size and mapper and attach it to the composer
   AnnContainer batesStampContainer = new AnnContainer();
   batesStampContainer.Size = mainContainer.Size;
   batesStampContainer.Mapper = mainContainer.Mapper.Clone();

   //Apply Bates Stamp to our container
   batesStampComposer.TargetContainers.Add(batesStampContainer);

   //insert the Bates stamp container below all other containers in the automation 
   automation.Containers.Insert(0, batesStampContainer);

   //print the content of this Bates stamp
   Debug.WriteLine(batesStamp.AsString(batesStampContainer)); //  the output will be "000001 1/1/0001 2:00:00 AM This is text element"

   //Render the containers
   automation.Invalidate(LeadRectD.Empty);

using (RasterCodecs codecs = new RasterCodecs())
{
   using (RasterImage image = codecs.Load(@"C:\Users\Public\Documents\LEADTOOLS Images\Leadtools.pdf"))
   {
      // Create AnnBatesStampComposer instance and add the created Bates stamp to it
      using (AnnBatesStampComposer batesStampComposer = new AnnBatesStampComposer())
      {
         //Set the rendering engine
         AnnBatesStampComposer.RenderingEngine = new AnnWinFormsRenderingEngine();
         //Create Bates stamp container
         AnnContainer batesStampContainer = new AnnContainer();
         // Map the resolutions of the AnnContainer to match the image
         batesStampContainer.Mapper.MapResolutions(image.XResolution, image.YResolution, image.XResolution, image.YResolution);
         // Set the size of the AnnContainer based on the size of the image
         batesStampContainer.Size = batesStampContainer.Mapper.SizeToContainerCoordinates(LeadSizeD.Create(image.Width, image.Height));

         // Create AnnBatesStamp and set its properties
         using (AnnBatesStamp batesStamp = new AnnBatesStamp())
         {
            batesStamp.HorizontalAlignment = AnnHorizontalAlignment.Left;
            batesStamp.VerticalAlignment = AnnVerticalAlignment.Top;
            batesStamp.Logo.Opacity = 0.5;
            batesStamp.Logo.Angle = -45;
            batesStamp.Logo.StretchLogo = true;
            batesStamp.Logo.Picture = new AnnPicture(@"watermark.png");
            // Add the AnnBatesStamp to the collection
            batesStampComposer.Stamps.Add(batesStamp);
            // Add the AnnContainer to the collection
            batesStampComposer.TargetContainers.Add(batesStampContainer);

            // Render the AnnContainer on the image
            AnnBatesStampComposer.RenderingEngine.RenderOnImage(batesStampContainer, image);

            // Save the resulting RasterImage which contains the newly created watermark
            codecs.Save(image, @"Watermarked_PDF.pdf", RasterImageFormat.RasPdf, 0);
         }
      }
   }
}