' For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
Using doc As DiagramDocument = Document.Load(Of DiagramDocument)(Utilities.MapSourceFilePath(FilePath))
' Initialize text watermark
Dim textWatermark As New TextWatermark("Test watermark 1", New Font("Calibri", 19))
' Add text watermark to all background pages
doc.AddWatermark(textWatermark, DiagramWatermarkPlacementType.BackgroundPages)
' Initialize image watermark
Using imageWatermark As New ImageWatermark("D:\logo.jpg")
' Add image watermark to all background pages
doc.AddWatermark(imageWatermark, DiagramWatermarkPlacementType.ForegroundPages)
End Using
doc.Save()
End Using