How to remove hyperlink from existing PDF document?

[C#]
 
//Load the file
PdfLoadedDocument lDoc = new PdfLoadedDocument("../../Data/TextWebLink.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 annotaion
PdfLoadedAnnotation annot = annotColl[j] as PdfLoadedAnnotation;
 
 
if (annot is PdfLoadedTextWebLinkAnnotation || annot is PdfLoadedUriAnnotation)
{
 
//remove the hyperlinks
annotColl.Remove(annot);
 
}
}
 
}
 
lDoc.Save("Sample.pdf");
lDoc.Close(true);