Import or Export Annotations from PDF and XFDF using C# VB.NET

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You can read all details at: Import or Export Annotations from PDF to XFDF using C# VB.NET

ExportAnnotationsPDF.cs

// Create an object of PdfAnnotationEditor class
PdfAnnotationEditor editor = new PdfAnnotationEditor();
// Bind input PDF file
editor.BindPdf(dataDir + "inFile.pdf");
// Create a file stream for output XFDF file to export annotations
FileStream fileStream = new FileStream(dataDir + "exportannotations.xfdf", FileMode.Create, FileAccess.Write);
// Create an enumeration of all the annotation types which you want to export
Enum[] annoType = { AnnotationType.Text };
// Export annotations of specified type(s) to XFDF file
editor.ExportAnnotationsXfdf(fileStream, 1, 5, annoType);

ImportAnnotationsPDF.cs

// Create an object of PdfAnnotationEditor class
PdfAnnotationEditor editor = new PdfAnnotationEditor();
// Bind input PDF file
editor.BindPdf(dataDir + "inFile.pdf");
// Create a file stream for input XFDF file to import annotations
FileStream fileStream = new FileStream(dataDir + "exportannotations.xfdf", FileMode.Open, FileAccess.Read);
// Create an enumeration of all the annotation types which you want to import
Enum[] annType = { AnnotationType.Text };
// Import annotations of specified type(s) from XFDF file
editor.ImportAnnotationFromXfdf(fileStream, annType);
// Save output pdf file
editor.Save(dataDir + "ImportAnnotations_out.pdf");