eSign Spreadsheet with Metadata signature

GroupDocs.Signature provides SpreadsheetMetadataSignature class to specify different Metadata signature objects for MetadataSignOptions instance to sign Spreadsheet document files.
Spreadsheet document metadata is hidden attributes, some of them are visible only over viewing standard document properties like Author, Creation Date, Producer, Entry, Keywords etc.
Spreadsheet document metadata contains pair of Name and Value, Name should be unique within the document.
Spreadsheet document metadata could keep big amount of data that allows provides ability to keep serialized custom objects with additional encryption in there.

Here are the steps to add metadata signatures into Spreadsheet document with GroupDocs.Signature:

Create new instance of Signature class and pass source document path as a constructor parameter.
Instantiate the MetadataSignOptions object according to your requirements.
Instantiate one or severalSpreadsheetMetadataSignature objects and add them into MetadataSignOptions to metadata signatures collection (Signatures) via Add or AddRange method.
Call Sign method of Signature class instance and pass MetadataSignOptions to it.

How to eSign Spreadsheet with Metadata signature

This example shows how to add Metadata e-signature to a Spreadsheet document.

using (Signature signature = new Signature("sample.xlsx"))
{
    MetadataSignOptions options = new MetadataSignOptions();

    // Create few Spreadsheet Metadata signatures
    SpreadsheetMetadataSignature[] signatures = new SpreadsheetMetadataSignature[]
    {
        new SpreadsheetMetadataSignature("Author", "Mr.Scherlock Holmes"),
        new SpreadsheetMetadataSignature("DateCreated", DateTime.Now),
        new SpreadsheetMetadataSignature("DocumentId", 123456),
        new SpreadsheetMetadataSignature("SignatureId", 123.456M)
    };
  
    // add these signatures to options
    options.Signatures.AddRange(signatures);
    signature.Sign("SampleSigned.xlsx", options);
}

More resources

Advanced Usage Topics

To learn more about document eSign features, please refer to the advanced usage section.

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.

eSign Presentation with Metadata signature eSign Word Processing document with Metadata signature