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

' initialize XlsMetadata
Dim xlsMetadata As XlsMetadata = xlsFormat.DocumentProperties

'update document property...
xlsMetadata.Author = "New author"
xlsMetadata.Subject = "New subject"

'save output file...
xlsFormat.Save(Common.MapDestinationFilePath(filePath))