Merge two pdf's both lanscape and portrait in to one pdf using itextsharp

IT KNOWLEDGE IS APPLIED KNOWLEDGE
So Just Do It

public static void CombineMultiplePDFs(string[] fileNames, string outFile)

  {

        int pageOffset = 0;

        int f = 0;

        Document document = null;

        PdfCopy writer = null;

        while (f < fileNames.Length)

        {

            // we create a reader for a certain document

            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();

        }

    }