Cacher is the code snippet organizer for pro developers

' 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))
    ' Remove header
    doc.HeaderFooter.HeaderCenter = Nothing

    ' Replace footer
    doc.HeaderFooter.FooterCenter = "Footer center"
    doc.HeaderFooter.Font.Size = 19
    doc.HeaderFooter.Font.FamilyName = "Calibri"
    doc.HeaderFooter.TextColor = Color.Red

    doc.Save()
End Using