private void radioButtonPDFKMTopMarker_CheckedChanged(object sender, EventArgs e)
 {
     _pdfkeywordmarker = PDFKeywordMarker.TopMarker;
 }
 private void changePdfKeywordMarker(PDFKeywordMarker value)
 {
     switch (value)
     {
         case PDFKeywordMarker.None:
             radioButtonPDFKMNone.Checked = true;
             break;
         case PDFKeywordMarker.TopMarker:
             radioButtonPDFKMTopMarker.Checked = true;
             break;
         case PDFKeywordMarker.AllMarker:
             radioButtonPDFKMAllMarker.Checked = true;
             break;
     }
 }