//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 document without watermarkwatermark 
        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");
 }
 
    }