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' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As PdfDocument = Document.Load(Of PdfDocument)(Utilities.MapSourceFilePath(FilePath))
    Dim textWatermark As New TextWatermark("This is a print only test watermark. It won't appear in view mode.", New Font("Arial", 8))
    Dim isPrintOnly As Boolean = True

    ' Annotation will be printed, but not displayed in pdf viewing application
    doc.Pages(0).AddAnnotationWatermark(textWatermark, isPrintOnly)

    doc.Save()
End Using