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

' initialize PptMetadata
Dim pptMetadata As PptMetadata = pptFormat.DocumentProperties

' update document property
pptMetadata.Author = "New author"
pptMetadata.Subject = "New subject"
pptMetadata.Manager = "Usman"

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