How to protect cells and sheet elements in C++.NET

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

using namespace System;
using namespace System::Drawing;
using namespace EasyXLS;
using namespace EasyXLS::Constants;

int main()
{
    Console::WriteLine("Tutorial 06\n----------\n");

    // Create an instance of the class that creates Excel files, having two sheets
    ExcelDocument ^workbook = gcnew 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
    ExcelWorksheet ^xlsFirstTab = safe_cast<ExcelWorksheet^>(workbook->easy_getSheetAt(0));
    ExcelTable ^xlsFirstTable = xlsFirstTab->easy_getExcelTable();

    // Create the formatting style for the header
    ExcelStyle ^xlsStyleHeader = gcnew ExcelStyle("Verdana", 8, true, true, Color::Yellow);
    xlsStyleHeader->setBackground(Color::Black);
    xlsStyleHeader->setBorderColors(Color::Gray, Color::Gray, Color::Gray, Color::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(String::Concat("Column ",(column + 1).ToString()));
        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(
                String::Concat("Data ", (row + 1).ToString(), ", ", (column + 1).ToString()));
        }
    }

    // Create a formatting style for cells
    ExcelStyle ^xlsStyleData = gcnew ExcelStyle();
    xlsStyleData->setHorizontalAlignment(Alignment::ALIGNMENT_LEFT);
    xlsStyleData->setForeground(Color::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(String::Concat("\nError encountered: ", sError, "\nPress Enter to Exit..."));

    // Dispose memory
    delete workbook;

    Console::ReadLine();

    return 0;
}