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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 (XlsFilePath)))
{
    Font font = new Font("Calibri", 12);
    TextWatermark watermark = new TextWatermark("Test watermark", font);
    watermark.HorizontalAlignment = HorizontalAlignment.Right;
    watermark.VerticalAlignment = VerticalAlignment.Bottom;
    
    // Set relative margins. Margin value will be interpreted as a portion of appropriate parent dimension.
    // If this type is chosen, margin value must be between 0.0 and 1.0.
    watermark.Margins.MarginType = MarginType.RelativeToParentDimensions;
    watermark.Margins.Right = 0.1;
    watermark.Margins.Bottom = 0.2;

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