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' For complete examples and data files, please go to https://github.com/groupdocs-metadata/GroupDocs.Metadata-for-.NET
' initialize Pdfformat
Dim pdfFormat As New PdfFormat(Common.MapSourceFilePath(filePath))

' inspect document
Dim inspectionResult As PdfInspectionResult = pdfFormat.InspectDocument()

' get annotations
Dim annotation As PdfAnnotation() = inspectionResult.Annotations

' if annotations are presented
If annotation.Length > 0 Then
    ' remove all annotation
    pdfFormat.RemoveHiddenData(New PdfInspectionOptions(PdfInspectorOptionsEnum.Annotations))

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