' 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(DocFilePath))
Dim watermark = New TextWatermark("Test watermark", New Font("Arial", 42))
watermark.HorizontalAlignment = HorizontalAlignment.Right
watermark.VerticalAlignment = VerticalAlignment.Top
watermark.SizingType = SizingType.ScaleToParentDimensions
watermark.ScaleFactor = 1
watermark.RotateAngle = 45
watermark.ForegroundColor = Color.Red
watermark.BackgroundColor = Color.Aqua
' Add watermark considering parent margins
watermark.ConsiderParentMargins = True
doc.AddWatermark(watermark)
doc.Save()