Extract pages from pdf to new pdf using iTextSharp

This is sample of code to extract pages from pdf file to new file

public static void Main(string[] args)         {             try             {                 string sourcePath = args[0];                 string outputPath = args[1];                 PdfReader reader = new PdfReader(sourcePath);                 Document document = new Document(reader.GetPageSizeWithRotation(1));                 PdfCopy copier = new PdfCopy(document, new FileStream(outputPath, FileMode.Create));                 //PdfCopy copier = PdfCopy.GetInstance(document, new FileStream(args[1], FileMode.Create));                 int startpage = int.Parse(args[2]);                 int endpage = int.Parse(args[3]);                 document.Open();                 for (int pageCounter = startpage; pageCounter <= endpage && pageCounter < reader.NumberOfPages + 1;                     pageCounter++)                 {                     PdfImportedPage page = copier.GetImportedPage(reader, pageCounter);                     //byte[] page = reader.GetPageContent(pageCounter);                     copier.AddPage(page);                 }                 document.Close();                 reader.Close();             }             catch (DocumentException de)             {                 System.Console.Error.WriteLine(de.Message);             }             catch (IOException ioe)             {                 System.Console.Error.WriteLine(ioe.Message);             }         }