How to remove hyperlinks from the existing PDF document?

//Load the file
PdfLoadedDocument lDoc = new PdfLoadedDocument(@"input.pdf");
 
for (int i = 0; i < lDoc.Pages.Count; i++)
{
//Get the annotation collection
PdfAnnotationCollection annotColl = lDoc.Pages[i].Annotations as PdfLoadedAnnotationCollection;
 
for (int j = 0; j < annotColl.Count; j++)
{
//Get the annotation
PdfLoadedAnnotation annot = annotColl[j] as PdfLoadedAnnotation;
 
 
if (annot is PdfLoadedTextWebLinkAnnotation || annot is PdfLoadedUriAnnotation)
{
//Remove the hyperlinks
annotColl.Remove(annot);
}
}
}
//Save and close the document
lDoc.Save(@"sample.pdf");
lDoc.Close(true);