How to merge multiple pdf into single pdf asp.net core

You can merge multiple PDF files into a single PDF using the MergeFiles Method from the PDFFile class. Here is an example and documentation:
 

string srcFile = @"C:\inputfolder\1.pdf";
string dstFile = @"C:\outputfolder\output.pdf";
 
PDFFile pdfFile = new PDFFile(srcFile); 
PDFPageRange[] srcPages = new PDFPageRange[2]; 
srcPages[1].FileName = @"C:\inputfolder\2.pdf"; // add another PDF to merge
pdfFile.MergeFiles(srcPages, dstFile);

https://www.leadtools.com/help/sdk/v22/dh/pdf/pdffile-mergefiles.html
 

https://www.dynamicpdf.com/examples/merge-pdf-.net-core

https://www.c-sharpcorner.com/article/merge-multiple-pdf-files-into-single-pdf-using-itextsharp-in-c-sharp/

Hi,

You can install Spire.PDF from NuGet: PM> Install-Package Spire.PDF

Then use several lines of code to merge multiple PDF files into one:

using System;
using Spire.Pdf;

namespace MergePDFs
{
    class Program
    {
        static void Main(string[] args)
        {
            //Get the paths of the documents to be merged
            String[] files = new String[] {
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-1.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-2.pdf",
                "C:\\Users\\Administrator\\Desktop\\PDFs\\sample-3.pdf"};

            //Merge these documents and return an object of PdfDocumentBase
            PdfDocumentBase doc = PdfDocument.MergeFiles(files);

            //Save the result to a PDF file
            doc.Save("output.pdf", FileFormat.PDF);
        }
    }
}

https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Merge-PDF-Files-with-New-Method-in-C.html

You can achieve this with the help of ItextSharp. Please find the reference link 

https://www.c-sharpcorner.com/article/merge-number-of-pdf-into-a-single-pdf-using-itextsharp/

https://help.syncfusion.com/file-formats/pdf/merge-documents?cs-save-lang=1&cs-lang=csharp

Hi Kavya,

Please refer this one,

https://www.c-sharpcorner.com/article/merge-pdf/