How to merge multiple pdf files in .net

         

Step: 1 Function for merge

public void MergePDFs(string[] fileNames, string outFile)

        {

            int pageOffset = 0;

            ArrayList master = new ArrayList();

            int f = 0;

            Document document = null;

            PdfCopy writer = null;

            while (f < (GetArrayOccupiedLenght(fileNames)-1)) //fileNames.Length-1

            {

                PdfReader reader = new PdfReader(fileNames[f]);

                reader.ConsolidateNamedDestinations();

                // we retrieve the total number of pages

                int n = reader.NumberOfPages;

                pageOffset += n;

                if (f == 0)

                {

                    // step 1: creation of a document-object

                    document = new Document(reader.GetPageSizeWithRotation(1));

                    // step 2: we create a writer that listens to the document

                    writer = new PdfCopy(document, new FileStream(outFile, FileMode.Create));

                    // step 3: we open the document

                    document.Open();

                }

                // step 4: we add content

                for (int i = 0; i < n; )

                {

                    ++i;

                    if (writer != null)

                    {

                        PdfImportedPage page = writer.GetImportedPage(reader, i);

                        writer.AddPage(page);

                    }

                }

                PRAcroForm form = reader.AcroForm;

                if (form != null && writer != null)

                {

                    writer.CopyAcroForm(reader);

                }

                f++;

            }

            // step 5: we close the document

            if (document != null)

            {

                document.Close();

            }

        }

Step2: How to Call

public void MyPDFs()

{

string[] files;

string MergedPath;

files[0] = "D:\abc.pdf";

files[1] = "D:\xyz.pdf";

files[2] = "D:\pqr.pdf";

MergedPath = "D:\MergedFile.pdf";

MergePDFs(files,MergedPath);

} 

Note : Don't forget to use the iTextSharp Namespace.