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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (Document doc = Document.Load(Utilities.MapSourceFilePath (DocFilePath)))
{
    Font font = new Font("Times New Roman", 8);
    TextWatermark watermark = new TextWatermark("Test watermark", font);

    // Set watermark coordinates
    watermark.X = 10;
    watermark.Y = 20;

    // Set watermark size
    watermark.Width = 100;
    watermark.Height = 40;

    doc.AddWatermark(watermark);
    doc.Save();
}