GroupDocs.Signature

We are pleased to announce another monthly release of GroupDocs.Signature for .NET. This latest release 18.11 of the API comes up with a multitude of new features like the ability to add form-field signatures in PDF documents and many more. We therefore recommend you to download the new version of the API to evaluate the exciting new features and enhance your document e-signing experience.

Features

Sign PDF Document with a Form-Field SignatureThe Form-Field Signatures are the input control which are placed in a document page. Following example demonstrates how to add Checkbox in a PDF document:

// instantiate check-box form field signature
FormFieldSignature checkboxSignature = new PdfCheckboxFormFieldSignature("FieldCheckbox", true);
// instantiate options based on check-box form field signature
PdfFormFieldSignOptions checkboxOptions = new PdfFormFieldSignOptions(checkboxSignature)
{
    HorizontalAlignment = HorizontalAlignment.Left,
    VerticalAlignment = VerticalAlignment.Top,
    Margin = new Padding(120, 20, 0, 0),
    Height = 10,
    Width = 10
};
// sign document
string signedPath = handler.Sign("02_pages.pdf", checkboxOptions,
    new SaveOptions { OutputType = OutputType.String, OutputFileName = "Pdf_FormFields" });

Search Form-Field Signatures in a PDF DocumentAPI allows you to search for Form-Field Signatures like Text, Checkbox or Digital within the document. Following example demonstrates how to search Form-Field Signature in PDF document:

// setup search options
PdfSearchFormFieldOptions searchOptions = new PdfSearchFormFieldOptions();
searchOptions.SearchAllPages = true;
searchOptions.NamePattern = @"Field";
searchOptions.Value = @"Value1";
// search document
SearchResult result = handler.Search("Pdf_FormFields_Signed.pdf", searchOptions);

Metadata Signatures for Slides documentThe Metadata Signature is the additional document property that contains special attributes/tags to keep non visual information inside the document. Following example demonstrates how to compose Metadata Signature options for Slides document:

// setup options with text of signature
SlidesMetadataSignOptions signOptions = new SlidesMetadataSignOptions();
// Specify different Metadata Signatures and add them to options sigature collection
// setup Author property
SlidesMetadataSignature mdSign_Author = new SlidesMetadataSignature("Author", "Mr.Scherlock Holmes");
signOptions.MetadataSignatures.Add(mdSign_Author);
// setup data of document id
SlidesMetadataSignature mdSign_DocId = new SlidesMetadataSignature("DocumentId", Guid.NewGuid().ToString());
signOptions.MetadataSignatures.Add(mdSign_DocId);
// setup data of sign date
SlidesMetadataSignature mdSign_Date = new SlidesMetadataSignature("SignDate", DateTime.Now);
signOptions.MetadataSignatures.Add(mdSign_Date);
// setup some integer value
SlidesMetadataSignature mdSign_Days = new SlidesMetadataSignature("DocDays", 12345);
signOptions.MetadataSignatures.Add(mdSign_Days);
// setup data of sign date
SlidesMetadataSignature mdSign_Koeff = new SlidesMetadataSignature("SignKoeff", 2.345M);
signOptions.MetadataSignatures.Add(mdSign_Koeff);
// sign document
string signedPath = handler.Sign("test.pptx", signOptions,
    new SaveOptions { OutputType = OutputType.String, OutputFileName = "Slides_Documents_Metadata" });

Search Metadata Signature in a Slides documentYou can search for Metadata Signatures within the Slides document. Following example demonstrates how to search Metadata Signatures in Slides document:

// setup search options
SlidesSearchMetadataOptions searchOptions = new SlidesSearchMetadataOptions();
// set if we need built-in signatures
searchOptions.IncludeBuiltinProperties = true;
// search document
SearchResult result = handler.Search("SignedMetadata.pptx", searchOptions);

Additional Verification CriteriaThis latest version of the API provides few additional properties to verify Digital Signatures of Words document.

// setup digital verification options
WordsVerifyDigitalOptions verifyOptions = new WordsVerifyDigitalOptions("SherlockHolmes.cer");
verifyOptions.Comments = "Test1";
verifyOptions.SubjectName = "Signature";
verifyOptions.IssuerName = "GroupDocs";
verifyOptions.SignDateTimeFrom = new DateTime(2017, 1, 26, 14, 55, 57);
verifyOptions.SignDateTimeTo = new DateTime(2017, 1, 26, 14, 55, 59);        
//verify document
VerificationResult result = handler.Verify("digital signatures.docx", verifyOptions);

Available Channels and Resources

Here are a few channels and resources for you to learn, try and get technical support on GroupDocs.Signature API for .NET:

Feedback

As always, you are welcome to share your feedback to improve this product. We will be happy to know your thoughts. Just create a forum thread and our dedicated support team will be there to respond.