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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 watermark = New TextWatermark("Test watermark", New Font("Arial", 42))
    watermark.HorizontalAlignment = HorizontalAlignment.Right
    watermark.VerticalAlignment = VerticalAlignment.Top
    watermark.SizingType = SizingType.ScaleToParentDimensions
    watermark.ScaleFactor = 1

    doc.PageMarginType = PdfPageMarginType.BleedBox
    watermark.ConsiderParentMargins = True
    doc.AddWatermark(watermark)
    doc.Save()
End Using