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How to add form fields in an existing PDF file 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 form fields in an existing PDF file using C# and VB.NET.

Steps to add a form fields in an existing PDF document programmatically:

  1. Create a new C# console application project.

Create a console application project

  1. Install the Syncfusion.Pdf.WinForms NuGet package as reference to your .NET Framework application from NuGet.org.

NuGet package reference screenshot

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



  1. Use the following code snippet to add a form fields in existing PDF document.



Download the work sample from PDFFormSample.zip.

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

Output document screenshot

Take a moment to peruse the documentation, where you can find the options like creating a form in new PDF document, modifying existing form fields, filling form fields, removing editing capability, removing form fields, importing FDF file to PDF, export PDF file to FDF, adding actions to form fields and features like XFA Form, adding annotation to PDF, etc., with code examples.

Refer here to learn more about Syncfusion PDF forms.


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.








Article ID: Published Date: Last Revised Date: Platform: Control:
6011 01/19/2016 11/16/2018 Windows Forms PDF
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