Sign documents with exception handling

GroupDocs.Signature provides different error messages due to validation issues, missing required data, files etc. For exception class GroupDocsSignatureException is being used.

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

This example shows how to handle GroupDocs.Signature exceptions.

try
{
    using (Signature signature = new Signature("sample.xlsx"))
    {
        DigitalSignOptions options = new DigitalSignOptions()
        {
            CertificateFilePath = Constants.CertificatePfx,
            ImageFilePath = Constants.ImageHandwrite,
            // skip password specification
            //Password = "123456780"
        };
        // sign document to file
        signature.Sign("signed.xlsx", options);
    }
}
catch (GroupDocsSignatureException ex)
{
    Console.WriteLine("GroupDocs Signature Exception: " + ex.Message);
}
catch (Exception ex)
{
    Console.WriteLine("System Exception: " + ex.Message);
}

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.