//Initialize an instance of the PdfDocument instance
PdfDocument doc = new PdfDocument();

//Load a PDF document
doc.LoadFromFile(inputFile);

//Initialize an instance of the StringBuilder class
StringBuilder sb = new StringBuilder();

//Get the form from the document
PdfFormWidget formWidget = doc.Form as PdfFormWidget;

//Iterate through all fields in the form
for (int i = 0; i < formWidget.FieldsWidget.List.Count; i++)
{

    PdfField field = formWidget.FieldsWidget.List[i] as PdfField;

    //Get the ButtonField
    if (field is PdfButtonWidgetFieldWidget)
    {
        PdfButtonWidgetFieldWidget buttonField = field as PdfButtonWidgetFieldWidget;
        // Get the field name
        string filename = buttonField.Name;

        // Get the action
        PdfAction action = buttonField.Actions.MouseDown;
        if (buttonField.Actions.MouseDown != null && buttonField.Actions.MouseDown is PdfHideAction)
        {
            var btnAction = (PdfHideAction)buttonField.Actions.MouseDown;
            sb.AppendLine(filename + "-MouseDown-Hide-" + btnAction.IsHide.ToString());
            sb.AppendLine(filename + "-MouseDown-fname-" + btnAction.FieldName[0].ToString());
        }
    }
}
File.WriteAllText(outputFile, sb.ToString());
doc.Dispose();

PdfDocument doc = new PdfDocument();
    doc.LoadFromFile(pdffile);
    doc.PrintSettings.SelectPageRange(1, 5);
    if(doc.PrintSettings.CanDuplex)
    {
        doc.PrintSettings.Duplex = PdfDuplex.Vertical;
    }
   doc.Print();