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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(PptFilePath))
    ' Use path to the image as constructor parameter
    Using watermark As New ImageWatermark("D:\watermark.jpg")
        ' Add watermark to the document
        doc.AddWatermark(watermark)

        doc.Save()
    End Using
End Using