Append two or more existing PDF files
The following code sample shows how to append PDF files.
// create the target document
Document documentOut = new Document();
// append 2 documents
using (FileStream file1 = new FileStream("1.pdf", FileMode.Open, FileAccess.Read))
using (FileStream file2 = new FileStream("2.pdf", FileMode.Open, FileAccess.Read))
{
Document documentIn = new Document(file1);
foreach (Page page in documentIn.Pages)
{
// append each page to the target document
// it is required to clone the page
documentOut.Pages.Add(page.Clone());
}
documentIn = new Document(file2);
// append all pages to the target document
documentOut.Pages.AddRange(documentIn.Pages.CloneToArray());
}
' create the target document
Dim documentOut As New Document()
' append 2 documents
Using inFile1 As New FileStream("..\..\..\inputDocuments\PackingLightBrochure.pdf", FileMode.Open, FileAccess.Read)
Using inFile2 As New FileStream("..\..\..\inputDocuments\TheresMoreToAcrobat.pdf", FileMode.Open, FileAccess.Read)
Dim documentIn As Document
documentIn = New Document(inFile1)
For Each page As Page In documentIn.Pages
' append page to the target document, we don't want to change the documentIn, so Clone the page.
documentOut.Pages.Add(page.Clone())
Next
documentIn = New Document(inFile2)
' append all pages to the target document
documentOut.Pages.AddRange(documentIn.Pages.CloneToArray())
' write the target document to disk
' note that when the target document is written, the source streams
' must still be open. for efficiency reasons, all source page content
' is extracted as late as possible
Using outFile As New FileStream("..\..\append.pdf", FileMode.Create, FileAccess.Write)
documentOut.Write(outFile)
End Using
End Using
End Using

PDFKit.NET 4.0
Create and manipulate PDF documents. Split, append, stamp, encrypt, extract, fill and more.
Single assembly
Convert PDF to JPG PNG
Convert to multi-page TIFF
Print PDF unattended

PDFKit.NET 5.0
Create and manipulate PDF documents. Split, append, stamp, encrypt, extract, fill and more.
Single assembly
Convert PDF to JPG PNG
Convert to multi-page TIFF
Print PDF unattended