' 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))
' Add text watermark
Dim textWatermark As New TextWatermark("This is a test watermark", New Font("Arial", 8))
doc.Pages(0).AddWatermark(textWatermark)
' Add image watermark
Using imageWatermark As New ImageWatermark("D:\protect.jpg")
doc.Pages(1).AddWatermark(imageWatermark)
End Using
doc.Save()
End Using