How to add cell validation in J#.NET

package Tutorial13;

/* --------------------------------------------------------------
 * Tutorial 13
 * 
 * This tutorial shows how to create an Excel file in J# having
 * multiple sheets. The second sheet contains a named area range.
 * The A1:A10 cell range contains data validators, drop down list 
 * and whole number validation.
 * ----------------------------------------------------------- */

import System.*;
import EasyXLS.*;
import EasyXLS.Constants.*;

public class Tutorial13
{
    public Tutorial13()
    {
    }

    /** @attribute System.STAThread() */
    public static void main(String[] args)
    {
        Console.WriteLine("Tutorial 13\n----------\n");

        // Create an instance of the class that exports Excel files, having two sheets
        ExcelDocument workbook = new ExcelDocument(2);
            
        // Set the sheet names
        workbook.easy_getSheetAt(0).setSheetName("First tab");
        workbook.easy_getSheetAt(1).setSheetName("Second tab");

        // Get the table of data for the second worksheet and populate the worksheet
        ExcelWorksheet xlsSecondTab = (ExcelWorksheet)workbook.easy_getSheetAt(1);
        ExcelTable xlsSecondTable = xlsSecondTab.easy_getExcelTable();
        xlsSecondTable.easy_getCell("A1").setValue("Range data 1");
        xlsSecondTable.easy_getCell("A2").setValue("Range data 2");
        xlsSecondTable.easy_getCell("A3").setValue("Range data 3");
        xlsSecondTable.easy_getCell("A4").setValue("Range data 4");
                
        // Create a named area range
        xlsSecondTab.easy_addName("Range", "=Second tab!$A$1:$A$4");

        // Add data validation as drop down list type
        ExcelWorksheet xlsFirstTab = (ExcelWorksheet)workbook.easy_getSheetAt(0);
        xlsFirstTab.easy_addDataValidator("A1:A10", DataValidator.VALIDATE_LIST, 
                                                    DataValidator.OPERATOR_EQUAL_TO, "=Range", "");

        // Add data validation as whole number type
        xlsFirstTab.easy_addDataValidator("B1:B10", DataValidator.VALIDATE_WHOLE_NUMBER, 
                                                    DataValidator.OPERATOR_BETWEEN, "=4", "=100");

        // Export Excel file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial13 - cell validation in Excel.xlsx.");
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial13 - cell validation in Excel.xlsx");

        // Confirm export of Excel file
        String sError = workbook.easy_getError();
        if (sError.Equals(""))
            Console.Write("\nFile successfully created. Press Enter to Exit...");
        else
            Console.Write("\nError encountered: " + sError + "\nPress Enter to Exit...");

        // Dispose memory
        workbook.Dispose();

        Console.ReadLine();
    }
}