Verify for multiple signatures

GroupDocs.Signature supports verification of documents for different signature types. This approach requires to add all required verification options to list.

Here are the steps to verify document for multiple signatures with GroupDocs.Signature:

This example shows how to search for different signature types in the document.

using (Signature signature = new Signature("sampleSigned.pdf"))
{
    TextVerifyOptions textVerifyOptions = new TextVerifyOptions()
    {
        AllPages = true, // this value is set by default
        SignatureImplementation = TextSignatureImplementation.Stamp,
        Text = "John",
        MatchType = TextMatchType.Contains
    };
    BarcodeVerifyOptions barcVerifyOptions = new BarcodeVerifyOptions()
    {
        AllPages = true, // this value is set by default
        Text = "John",
        MatchType = TextMatchType.Contains
    };
    QrCodeVerifyOptions qrcdVerifyOptions = new QrCodeVerifyOptions()
    {
        AllPages = true, // this value is set by default
        Text = "John",
        MatchType = TextMatchType.Contains
    };
    DigitalVerifyOptions digtVerifyOptions = new DigitalVerifyOptions("certificate.pdf")
    {
        Comments = "Test comment"
    };
    // verify document signatures
    List<VerifyOptions> listOptions = new List<VerifyOptions>();
    listOptions.Add(textVerifyOptions);
    listOptions.Add(barcVerifyOptions);
    listOptions.Add(qrcdVerifyOptions);
    listOptions.Add(digtVerifyOptions);
    VerificationResult result = signature.Verify(listOptions);
    if (result.IsValid)
    {
        Console.WriteLine("\nDocument was verified successfully!");
    }
    else
    {
        Console.WriteLine("\nDocument failed verification process.");
    }
}

Advanced Usage Topics

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

More resources

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.