How to merge PDF documents with grouped bookmarks in C# and VB.NET

The Syncfusion Essential PDF is a feature-rich and high performance .NET PDF library used to create, read, and edit PDF documents programmatically without Adobe dependencies. This library also offers functionality to merge, split, stamp, forms, compress, and secure PDF files.

This sample uses the following PDF documents and explains how to merge them with grouped bookmarks using Syncfusion .NET PDF library.

Steps to merge PDF documents with grouped bookmarks programmatically in C#:

1. Create a new C# console application project.
2. Install the Syncfusion.Pdf.WinForms NuGet package as a reference to your .NET Framework application from the NuGet.org. 
3. You can merge two PDF documents by using the Merge method of PdfDocumentBase class.

C#

//Merge PDF file
PdfDocumentBase.Merge(document, loadedDocument);

VB.NET

'Merge PDF file
PdfDocumentBase.Merge(document, loadedDocument)

4. Include the following namespaces in Program.cs file.

C#

using Syncfusion.Pdf;

VB.NET

Imports Syncfusion.Pdf

5. Include the following code snippet in main method of Program.cs file to merge PDF documents with grouped bookmarks.

C#

//Create a new PDF document
PdfDocument finalDoc = new PdfDocument();
 
//Create a string array of source files to be merged
string[] source = { "Document1.pdf", "Document2.pdf" };
 
//Merge the PDF documents
PdfDocument.Merge(finalDoc, source);
 
//Save the PDF document
finalDoc.Save("MergedDocument.pdf");
 
//Close the instance of PdfDocument
finalDoc.Close(true);

VB.NET

'Create a new PDF document
Dim finalDoc As PdfDocument = New PdfDocument
 
'Create a string array of source files to be merged
Dim source() As String = {"Document1.pdf", "Document2.pdf"}
 
'Merge the PDF documents
PdfDocument.Merge(finalDoc, source)
 
'Save the PDF document
finalDoc.Save("MergedDocument.pdf")
 
'Close the instance of PdfDocument
finalDoc.Close(True)

A complete work sample to merge PDF documents with grouped bookmarks can be downloaded from MergePDF.zip.

By executing the program, you will get the PDF document as follows.

Take a moment to peruse the documentation, where you will find other options like RTF to PDF conversion, XPS to PDF conversion, PDF to image conversion, HTML to MHTML, HTML to SVG, partial webpage to SVG, and more.

Click here to explore the rich set of Syncfusion Essential PDF features.

An online sample link to convert Word document to PDF, RTF to PDF, XPS to PDF, TIFF to PDF, PDF to Image, and Excel document to PDF.

See Also:

Merge all PDF files in a folder into single PDF document