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' For complete examples and data files, please go to https://github.com/groupdocs-viewer/GroupDocs.Viewer-for-.NET
' Create/initialize image handler 
Dim imageHandler As New ViewerImageHandler(Utilities.GetConfigurations())

' Set watermark properties
Dim watermark As New Watermark(WatermarkText)
watermark.Color = System.Drawing.Color.Blue
watermark.Position = WatermarkPosition.Diagonal
watermark.Width = 100

' Set watermark font name which contains Japanese characters
watermark.FontName = "MS Gothic"

Dim options As New PdfFileOptions()
options.Watermark = watermark

' To Apply transformations on PDF file
' options.Transformations = Transformation.Rotate | Transformation.Reorder | Transformation.AddPrintAction;

' Call GetPdfFile to get FileContainer type object which contains the stream of pdf file.
Dim container As FileContainer = imageHandler.GetPdfFile(DocumentName, options)

'Change the extension of the file and assign to a string type variable filename
Dim filename As [String] = Path.GetFileNameWithoutExtension(DocumentName) + ".pdf"

'Save each image at disk
Utilities.SaveFile(filename, container.Stream)