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TX Text Control provides a powerful API to sign PDF documents with signature fields and digital signatures. This article shows how to sign a PDF document with a digital signature using the TX Text Control API and to set custom signer information.

Pre-Populated Signer Information

Signer information, such as the reason for signing and the signer's address, can be added at the design time of the document or template. This information is stored in the internal TX Text Control document format and can be used to pre-fill the signature fields.

The following screenshots show a signature field and the ribbon bar with the pre-populated information:

When signing the document with a digital signature, the pre-populated information is used automatically.

Custom Signer Information

When signing a document with a digital signature, the signer information can be set programmatically using the &#9584; TX Text Control .NET Server &#9584; TXTextControl Namespace &#9584; SignatureField Class &#9584; SignerData Property Gets or sets a suggested signer&#039;s name, title and address and a reason why to sign the document. " data-tippy-interactive="true" data-tippy-placement="bottom" data-tooltip-width="wide"

>Signer Data property. This property is an instance of the &#9584; TX Text Control .NET Server &#9584; TXTextControl Namespace &#9584; SignerData Class An instance of the SignerData class represents the data of a suggested signer connected with a SignatureField. " data-tippy-interactive="true" data-tippy-placement="bottom" data-tooltip-width="wide"

>Signer Data class that provides the following properties:

Property Description Reason Gets or sets the reason for signing the document. Address Gets or sets the location of the signer. ContactInfo Gets or sets the contact information of the signer. Name Gets or sets the name of the signer. Title Gets or sets the title of the signer.

The following code snippet shows how to set the signer information for a signature field:

using System.Security.Cryptography.X509Certificates; using TXTextControl;

using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl()) { tx.Create(); tx.Load("signature.tx", TXTextControl.StreamType.InternalUnicodeFormat);

// create a certificate X509Certificate2 cert = new X509Certificate2("textcontrolself.pfx", "123");

// create a list of digital signatures var digitalSignatures = new List ();

foreach (SignatureField signatureField in tx.SignatureFields) { signatureField.SignerData = new SignerData( "John Doe", "CEO", "11 Main Street, New York, NY 10001, USA", "john@doe.com", "Contract signature");

// time stamp server var timeStampServer = "http://timestamp.digicert.com";

// create a digital signature object DigitalSignature digitalSignature = new DigitalSignature(cert, timeStampServer, signatureField.Name); // add the digital signature to the list digitalSignatures.Add(digitalSignature); }

// create save settings SaveSettings saveSettings = new SaveSettings() { CreatorApplication = "Your Application", SignatureFields = digitalSignatures.ToArray() };

// save the document as PDF tx.Save("results_signed.pdf", StreamType.AdobePDFA, saveSettings); } Additionally, the time server is added to the digital signature. The timeServerURL parameter is set to the URL of the time server.

When the document is signed, the signature field is updated with the custom signer information:

When the document is opened in Adobe Acrobat Reader, the custom signer information is displayed in the signature properties.

Conclusion

TX Text Control provides a powerful API to sign PDF documents with signature fields and digital signatures. The signer information can be pre-populated at the design time of the document or set programmatically using the SignerData property.

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