ملفات eSign Xlsx ذات توقيعات Digital في C#

        
// Set up input Xlsx file
string filePath = "input.xlsx";
// Set up output file
string outputFilePath = "output.xlsx";
// Provide digital certificate
string certificateFilePath = "certificate.pfx";

// Instantiate Signature for input file
using (GroupDocs.Signature.Signature signature = new GroupDocs.Signature.Signature(filePath))
{
        //Provide sign options
        DigitalSignOptions options = new DigitalSignOptions(certificateFilePath)
        {
            // set certificate password
            Password = "1234567890",
            // set signature position
            Left = 50,
            Top = 200,
        };

        // sign Xlsx document
        SignResult result = signature.Sign(outputFilePath, options);
}