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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (WordsDocument doc = Document.Load<WordsDocument>(Utilities.MapSourceFilePath(FilePath)))
{
    TextWatermark textWatermark = new TextWatermark("DRAFT", new Font("Arial", 42));

    // Add watermark to the last page
    doc.AddWatermark(textWatermark, doc.PageCount);
    doc.Save();
}