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'For complete examples and data files, please go to https://github.com/groupdocsmetadata/GroupDocs_Metadata_NET
Dim docFormat As New DocFormat(Common.MapSourceFilePath(filePath))

' use one of the following methods
' method:1 - clear custom properties 
docFormat.ClearCustomProperties()

' method:2 - clear custom properties 
docFormat.DocumentProperties.ClearCustomData()

' save file in destination folder
docFormat.Save(Common.MapDestinationFilePath(filePath))