// Create AIOptions configuration options
AIOptions options = new AIOptions();
        
// Set SpireToken Key
options.SpireToken = "**************************";

// Using the Workbook object
using (Workbook workbook = new Workbook())
{
    // Create an AI document processor
    AIDocumentProcessor processor = workbook.AI(options);

    // Natural language instruction
    string instruction = "Read the content of the attached document, extract key fields such as amount, tax rate, date, and supplier, and perform audits on 'invoice', 'contract', and 'reimbursement form'. Finally, generate an exception list in Excel format";

    // Execute AI instructions to generate an Excel exception list
       processor.ExecuteInstruction(workbook, instruction, "Exception List.xlsx", new string[] { "Contract.docx", "Invoice.pdf", "Expense Report.xlsx" });
}

// Using the Document object
{
    // Create an AI document processor
    AIDocumentProcessor processor = doc.AI(options);

    // Natural language instruction
    string instruction = "Read the content of the attached document, extract key fields such as amount, tax rate, date, and supplier, and perform audits on 'invoice', 'contract', and 'reimbursement form'. Finally, generate an audit report in Word format";

    // Execute AI instructions to generate a Word audit report
       processor.ExecuteInstruction(doc, instruction, "Audit Report.docx", new string[] { "Contract.docx", "Invoice.pdf", "Expense Report.xlsx" });
}