' 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))