//The value of this string is the watermark
        string watermark = "Classified";

        public void GenerateDocument()
        {
            /*// Create an instance of the WordApplication objectobject 
*/             WordApplication wwApp = new WordApplication();

            /*// Open the unclassified document */without  watermark 
          Document doc = wwApp.Open(@"..\..\TemplatesWordTemplateFiles/PreWatermark.doc");

            /*// Set the watermarkwatermark 
*/             doc.Watermark.Text = watermark;

            /*// Save the document to the Response streamstream 
*/             wwApp.Save(doc, @"..\..\OutputWordOutputFiles\Watermarked_out.doc");
 }
 
    }