How to protect cells and sheet elements in J#.NET

package Tutorial06;

/* -------------------------------------------------------------
 * Tutorial 06
 * 
 * This code sample shows how to create an Excel file in J# with
 * multiple sheets. The first sheet is protected and
 * filled with data. The cells are formatted and locked.
 * ---------------------------------------------------------- */

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

public class Tutorial06
{
    public Tutorial06()
    {
    }

    /** @attribute System.STAThread() */
    public static void main(String[] args)
    {
        Console.WriteLine("Tutorial 06\n----------\n");

        // Create an instance of the class that creates 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");

        // Protect first sheet
        workbook.easy_getSheetAt(0).setSheetProtected(true);

        // Get the table of data for the first worksheet
        ExcelTable xlsFirstTable = ((ExcelWorksheet)workbook.easy_getSheetAt(0)).easy_getExcelTable();

        // Create the formatting style for the header
        ExcelStyle xlsStyleHeader = new ExcelStyle("Verdana", 8, true, true, Color.get_Yellow());
        xlsStyleHeader.setBackground(Color.get_Black());
        xlsStyleHeader.setBorderColors(Color.get_Gray(), Color.get_Gray(), Color.get_Gray(), Color.get_Gray());
        xlsStyleHeader.setBorderStyles(Border.BORDER_MEDIUM, Border.BORDER_MEDIUM, 
                                            Border.BORDER_MEDIUM, Border.BORDER_MEDIUM);
        xlsStyleHeader.setHorizontalAlignment(Alignment.ALIGNMENT_CENTER);
        xlsStyleHeader.setVerticalAlignment(Alignment.ALIGNMENT_BOTTOM);
        xlsStyleHeader.setWrap(true);
        xlsStyleHeader.setDataType(DataType.STRING);

        // Add data in cells for report header
        for (int column=0; column<5; column++)
        {
            xlsFirstTable.easy_getCell(0, column).setValue("Column " + (column + 1));
            xlsFirstTable.easy_getCell(0, column).setStyle(xlsStyleHeader);
        }
        xlsFirstTable.easy_getRowAt(0).setHeight(30);

        // Add data in cells for report values
        for (int row=0; row<100; row++)
        {
            for (int column=0; column<5; column++)
            {
                xlsFirstTable.easy_getCell(row+1, column).setValue("Data " + (row + 1) + ", " + (column + 1));
            }
        }

        // Create a formatting style for cells
        ExcelStyle xlsStyleData = new ExcelStyle();
        xlsStyleData.setHorizontalAlignment(Alignment.ALIGNMENT_LEFT);
        xlsStyleData.setForeground(Color.get_DarkGray());
        xlsStyleData.setWrap(false);
        xlsStyleData.setDataType(DataType.STRING);
        // Protect cells
        xlsStyleData.setLocked(true);
        xlsFirstTable.easy_setRangeStyle("A2:E101", xlsStyleData);

        // Set column widths
        xlsFirstTable.setColumnWidth(0, 70);
        xlsFirstTable.setColumnWidth(1, 100);
        xlsFirstTable.setColumnWidth(2, 70);
        xlsFirstTable.setColumnWidth(3, 100);
        xlsFirstTable.setColumnWidth(4, 70);

        // Create Excel file
        Console.WriteLine("Writing file C:\\Samples\\Tutorial06 - protect Excel sheet.xlsx.");
        workbook.easy_WriteXLSXFile("C:\\Samples\\Tutorial06 - protect Excel sheet.xlsx");

        // Confirm the creation 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();
    }
}