I want to use VeryPDF PDF Split-Merge SDK product in C# to merge multiple PDF/A-1 files into a single PDF/A-1 file

Has there been a feature enhancement based on PDF Split-Merge COM/SDK product? I want to use it in C# to merge multiple PDF/A-1 files into a single, PDF/A-1 file.

https://www.verypdf.com/app/pdf-split-merge/pdf-split-merge-sdk.html

What I need to merge is a bunch of PDF/X-3 files, into a resulting PDF compliant with PDF/X-3.

I think I've looked everywhere. If you know the answer would you plz advise?

Thanks
Customer
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Thanks for your message, you may download the trial version of PDF Split-Merge COM/SDK from this web page,

https://www.verypdf.com/app/pdf-split-merge/try-and-buy.html#buy-sdk
https://www.verypdf.com/pdfpg/pdfsplitmergesdk.zip

after you download it, please run "install.vbs" with administrator privilege to register VeryPDFSplitMergeCOM.exe into your system first, you can also run following command line in a CMD window which own the administrator privilege,

VeryPDFSplitMergeCOM.exe /regserver

after you register VeryPDFSplitMergeCOM.exe into your system, you can use following C# code to merge more of your PDF files into one PDF file,

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;
using VeryPDFSplitMergeCOM;

namespace CSharp_WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string appPath = Path.GetDirectoryName(Application.ExecutablePath);
            System.Type VeryPDFSplitMergeCOMType =
                         System.Type.GetTypeFromProgID
                         ("VeryPDFSplitMergeCOM.com");
            VeryPDFSplitMergeCOM.com VeryPDFSplitMergeCOM =
                         (VeryPDFSplitMergeCOM.com)System.Activator.CreateInstance
                         (VeryPDFSplitMergeCOMType);

VeryPDFSplitMergeCOM.com_PDF_SetCode
("XXXXXXXXXXXXXXXXXXXXXXXXXXX");

string szPDFFile = appPath + "\\_out1.pdf";
System.IO.File.Copy(appPath + "\\testcmd.pdf", szPDFFile, true);

            int nRet = 0;
            nRet = VeryPDFSplitMergeCOM.com_VeryAppendPDF
                         (szPDFFile, appPath + "\\testcmd.pdf");
            nRet = VeryPDFSplitMergeCOM.com_VeryAppendPDF
                         (szPDFFile, appPath + "\\testcmd.pdf");
            nRet = VeryPDFSplitMergeCOM.com_VeryAppendPDF
                         (szPDFFile, appPath + "\\testcmd.pdf");
            nRet = VeryPDFSplitMergeCOM.com_VeryAppendPDF
                         (szPDFFile, appPath + "\\testcmd.pdf");
            int nPageCount =
                  VeryPDFSplitMergeCOM.com_VeryGetPDFFilePageCount(szPDFFile);
            MessageBox.Show(szPDFFile + " is contain " + nPageCount.ToString() + " pages.");
        }
    }
}

You can call com_VeryAppendPDF() method more times to append more PDF files into one PDF file.