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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 CellsDocument = Document.Load(Of CellsDocument)("D:\test.xlsx")
    Dim textWatermark As New TextWatermark("Test watermark", New Font("Arial", 8))
    doc.Worksheets(0).AddModernWordArtWatermark(textWatermark)
    doc.Save()
End Using