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How To Digitally Sign PDF Documents In .NET

Using PDFOne .NET and C#.
By V. Subhash

In PDFOne .NET Version 4.1, we introduced support for digital signing. In this article, we will see how to sign PDF documents using PDFOne .NET.

To sign PDF documents, you need a digital signature. Certificate Authorities (CA) provide you a PFX file for signing document. If you have this file and PDFOne .NET, you can start signing documents.

Just load a document, use one of the PDFDocument.AddSignature() overloads and save the signed document to a file or stream. It is very simple. (In the following C# code snippet, I have used a trial digital certificate from Ascertia.)

// Create a new document object
PDFDocument doc = new PDFDocument("your-license-key");

// Load an existing PDF
doc.Load("unsigned_doc.pdf");

// Add the signature
doc.AddSignature(
      "testmenow@mailinator.com.pfx",       // signature file
      "TestCase",                           // signature password
      "Approved",                           // reason
      "Ivory Tower",                        // location
      "I am in the book",                   // contact info
      1,                                    // page number
      "fldSign",                            // signature field name
      new RectangleF(4f, 4.8f, 2f, 0.4f));  // location

// Write signed document to file
doc.Save("signed_doc.pdf");

// Close the document
doc.Close();

Here is the signed document.

---o0O0o---

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