Merging multiple PDFs using iTextSharp in c#.net

I found a very nice solution on this site : http://weblogs.sqlteam.com/mladenp/archive/2014/01/10/simple-merging-of-pdf-documents-with-itextsharp-5-4-5.aspx

I update the method in this mode :

    public static bool MergePDFs(IEnumerable<string> fileNames, string targetPdf)
    {
        bool merged = true;
        using (FileStream stream = new FileStream(targetPdf, FileMode.Create))
        {
            Document document = new Document();
            PdfCopy pdf = new PdfCopy(document, stream);
            PdfReader reader = null;
            try
            {
                document.Open();
                foreach (string file in fileNames)
                {
                    reader = new PdfReader(file);
                    pdf.AddDocument(reader);
                    reader.Close();
                }
            }
            catch (Exception)
            {
                merged = false;
                if (reader != null)
                {
                    reader.Close();
                }
            }
            finally
            {
                if (document != null)
                {
                    document.Close();
                }
            }
        }
        return merged;
    }

I found the answer:

Instead of the 2nd Method, add more files to the first array of input files.

public static void CombineMultiplePDFs(string[] fileNames, string outFile)
{
    // step 1: creation of a document-object
    Document document = new Document();
    //create newFileStream object which will be disposed at the end
    using (FileStream newFileStream = new FileStream(outFile, FileMode.Create))
    {
       // step 2: we create a writer that listens to the document
       PdfCopy writer = new PdfCopy(document, newFileStream);

       // step 3: we open the document
       document.Open();

       foreach (string fileName in fileNames)
       {
           // we create a reader for a certain document
           PdfReader reader = new PdfReader(fileName);
           reader.ConsolidateNamedDestinations();

           // step 4: we add content
           for (int i = 1; i <= reader.NumberOfPages; i++)
           {
               PdfImportedPage page = writer.GetImportedPage(reader, i);
               writer.AddPage(page);
           }

           PRAcroForm form = reader.AcroForm;
           if (form != null)
           {
               writer.CopyAcroForm(reader);
           }

           reader.Close();
       }

       // step 5: we close the document and writer
       writer.Close();
       document.Close();
   }//disposes the newFileStream object
}