How can merge pdf file into single Pdf using Asp.net mvc5?

You can use the PDFFile MergeWith method to combine multiple PDF files in one PDF file. Here is some code which demonstrates this:

string sourceFileName1 = @"C:/Input/File1.pdf"); 
string sourceFileName2 = @"C:/Input/File2.pdf"); 
string sourceFileName3 = @"C:/Input/File3.pdf"); 
string destinationFileName = @"C:/Output/Merged.pdf"); 
 
// Merge 1 with (2, 3) and form destination 
PDFFile pdfFile = new PDFFile(sourceFileName1); 
pdfFile.MergeWith(new string[] { sourceFileName2, sourceFileName2 }, destinationFileName); 

https://www.leadtools.com/help/sdk/dh/pdf/pdffile-mergewith(string[],string).html
https://www.leadtools.com/help/sdk/tutorials/dotnet-winforms-merge-pdf-files-to-single-pdf-file.html 

Hello Sunny,

You can merge pdf files into a single pdf easily with Spire.PDF. 

Here is a simple example for you:

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);
        }
    }
}

You can visit this link for more detailed information:

https://www.e-iceblue.com/Tutorials/Spire.PDF/Spire.PDF-Program-Guide/Merge-PDF-Files-with-New-Method-in-C.html#1

Hello sunny,

You can do in various way using Itextsharp, IronPdf, Aspose,

Please refer below links,

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

https://products.aspose.com/words/net/merge/pdf/

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

Hello Sunny,

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

BENCHAABAN Ali