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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 Document = Document.Load(Utilities.MapSourceFilePath(DocFilePath))
    Dim font As New Font("Calibri", 8)
    Dim watermark As New TextWatermark("Test watermark", font)
    watermark.HorizontalAlignment = HorizontalAlignment.Right
    watermark.VerticalAlignment = VerticalAlignment.Top
    watermark.SizingType = SizingType.ScaleToParentDimensions
    watermark.ScaleFactor = 0.5

    ' Set rotation angle
    watermark.RotateAngle = 45

    doc.AddWatermark(watermark)
    doc.Save()
End Using