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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (PdfDocument doc = Document.Load<PdfDocument>(Utilities.MapSourceFilePath (FilePath)))
{
    // Add text watermark
    TextWatermark textWatermark = new TextWatermark("This is an artifact watermark", new Font("Arial", 8));
    doc.AddArtifactWatermark(textWatermark);

    // Add image watermark
    //using (ImageWatermark imageWatermark = new ImageWatermark(@"D:\logo.bmp"))
    //{
    //    doc.AddArtifactWatermark(imageWatermark);
    //}
    doc.Save();
}