How to add attachment to a PDF using C# and VB.NET
Syncfusion Essential PDF is a .NET PDF library used to create, read, and edit PDF documents. Using this library, you can add attachment to a PDF using C# and VB.NET. Attachments contain any kind of files with detailed information.
Steps to add attachment to the PDF programmatically:
- Create a new C# console application project.
- Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.
- Include the following namespace in the Program.cs file.
C#
using Syncfusion.Pdf; using Syncfusion.Pdf.Interactive; using System;
VB.NET
Imports Syncfusion.Pdf Imports Syncfusion.Pdf.Interactive Imports System
- Use the following code snippet to add attachment to PDF document.
C#
//Creates a new PDF document
PdfDocument document = new PdfDocument();
//Creates an attachment
PdfAttachment attachment = new PdfAttachment("Input.txt");
attachment.ModificationDate = DateTime.Now;
attachment.Description = "Input.txt";
attachment.MimeType = "application/txt";
//Adds the attachment to the document
document.Attachments.Add(attachment);
//Save the PDF document
document.Save("Attachment.pdf");
//Close the PDF document
document.Close(true);
//This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("Attachment.pdf");
VB.NET
'Creates a new PDF document
Dim document As New PdfDocument()
'Creates an attachment
Dim attachment As New PdfAttachment("Input.txt")
attachment.ModificationDate = DateTime.Now
attachment.Description = "Input.txt"
attachment.MimeType = "application/txt"
'Adds the attachment to the document
document.Attachments.Add(attachment)
'Save the PDF document
document.Save("Attachment.pdf")
'Close the PDF document
document.Close(True)
'This will open the PDF file so, the result will be seen in default PDF viewer
Process.Start("Attachment.pdf")
A complete working sample can be downloaded from PDFAttachmentSample.zip.
By executing the program, you will get the PDF document as follows. 
Take a moment to peruse the documentation, where you can find options like removing the attachment from an existing PDF, extracting and saving an attachment to the disk and other features like File Link Annotation, File Attachment Annotation, and hyperlink to PDF with code examples.
Refer here to explore the rich set of Syncfusion Essential PDF features.
An online sample link to attach files in PDF document.
Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, include a license key in your projects. Refer to link to learn about generating and registering Syncfusion license key in your application to use the components without trail message.
