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    <p>Using iTextSharp.dll</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { String[] files = @"C:\ENROLLDOCS\A1.pdf,C:\ENROLLDOCS\A2.pdf".Split(','); MergeFiles(@"C:\ENROLLDOCS\New1.pdf", files); } public void MergeFiles(string destinationFile, string[] sourceFiles) { if (System.IO.File.Exists(destinationFile)) System.IO.File.Delete(destinationFile); string[] sSrcFile; sSrcFile = new string[2]; string[] arr = new string[2]; for (int i = 0; i &lt;= sourceFiles.Length - 1; i++) { if (sourceFiles[i] != null) { if (sourceFiles[i].Trim() != "") arr[i] = sourceFiles[i].ToString(); } } if (arr != null) { sSrcFile = new string[2]; for (int ic = 0; ic &lt;= arr.Length - 1; ic++) { sSrcFile[ic] = arr[ic].ToString(); } } try { int f = 0; PdfReader reader = new PdfReader(sSrcFile[f]); int n = reader.NumberOfPages; Response.Write("There are " + n + " pages in the original file."); Document document = new Document(PageSize.A4); PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(destinationFile, FileMode.Create)); document.Open(); PdfContentByte cb = writer.DirectContent; PdfImportedPage page; int rotation; while (f &lt; sSrcFile.Length) { int i = 0; while (i &lt; n) { i++; document.SetPageSize(PageSize.A4); document.NewPage(); page = writer.GetImportedPage(reader, i); rotation = reader.GetPageRotation(i); if (rotation == 90 || rotation == 270) { cb.AddTemplate(page, 0, -1f, 1f, 0, 0, reader.GetPageSizeWithRotation(i).Height); } else { cb.AddTemplate(page, 1f, 0, 0, 1f, 0, 0); } Response.Write("\n Processed page " + i); } f++; if (f &lt; sSrcFile.Length) { reader = new PdfReader(sSrcFile[f]); n = reader.NumberOfPages; Response.Write("There are " + n + " pages in the original file."); } } Response.Write("Success"); document.Close(); } catch (Exception e) { Response.Write(e.Message); } } </code></pre>
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