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

' initialize PdfMetadata
Dim pdfMetadata As PdfMetadata = pdfFormat.DocumentProperties

' built-in properties
Console.WriteLine("Built-in Properties")
For Each [property] As KeyValuePair(Of String, PropertyValue) In pdfMetadata
    ' check if built-in property
    If pdfMetadata.IsBuiltIn([property].Key) Then
        Console.WriteLine("{0} : {1}", [property].Key, [property].Value)
    End If