Verifying documents with exception handling Leave feedback

GroupDocs.Signature provides different error messages due to validation issues, missing required data, files etc. For handling these exceptions class GroupDocsSignatureException should be used.

Here are the steps to handle exceptions from GroupDocs.Signature while document verification:

• Compose try-catch block above Verify method with catching GroupDocsSignatureException type error.

This example shows how to handle GroupDocs.Signature exceptions.

try
{
    using (Signature signature = new Signature("sample.pdf"))
    {
        DigitalVerifyOptions options = new DigitalVerifyOptions()
        {
            CertificateFilePath = "dummy.pfx",
            // skip password specification
            // Password = "1234567890"
        };
        // sign document to file
        VerificationResult result = signature.Verify(options);
    }
}
catch (GroupDocsSignatureException ex)
{
    Console.WriteLine("GroupDocs Signature Exception: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("System Exception: " + ex.Message);
}

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

• GroupDocs.Signature for .NET examples, plugins, and showcase
• GroupDocs.Signature for Java examples, plugins, and showcase
• Document Signature for .NET MVC UI Example
• Document Signature for .NET App WebForms UI Example
• Document Signature for Java App Dropwizard UI Example
• Document Signature for Java Spring UI Example

Along with the full-featured .NET library, we provide simple but powerful free online apps.

To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.