How to prevent specific columns from editing in exported excel file from WPF DataGrid (SfDataGrid)?

private static void OnExecuteExportToExcel(object sender, ExecutedRoutedEventArgs args)
{
    var dataGrid = args.Source as SfDataGrid;
    if (dataGrid == null) return;
    try
    {
        GetDataGridStyles(dataGrid);
 
        // Creating an instance for ExcelExportingOptions which is passed as a parameter to the ExportToExcel method.
        ExcelExportingOptions options = new ExcelExportingOptions();
        options.AllowOutlining = true;
        options.ExportingEventHandler = ExportingHandler;
        // Exports Datagrid to Excel and returns ExcelEngine.
        var excelEngine = dataGrid.ExportToExcel(dataGrid.View, options);
        // Gets the exported workbook from the ExcelEngine
        var workBook = excelEngine.Excel.Workbooks[0];
        var workSheet = workBook.Worksheets[0];
        var gridColumns = dataGrid.Columns.Where(col => col.AllowEditing).ToList();
        foreach(var column in workSheet.Columns)
        {
            if(gridColumns.Any(gridCol => gridCol.HeaderText == column.DisplayText))
                workSheet.Range[column.AddressLocal].CellStyle.Locked = false;
        }
        workSheet.Protect("syncfusion");
 
        // Saving the workbook.
        SaveFileDialog sfd = new SaveFileDialog
        {
            FilterIndex = 2,
            Filter = "Excel 97 to 2003 Files(*.xls)|*.xls|Excel 2007 to 2010 Files(*.xlsx)|*.xlsx"
        };
 
        if (sfd.ShowDialog() == true)
        {
            using (Stream stream = sfd.OpenFile())
            {
                if (sfd.FilterIndex == 1)
                    workBook.Version = ExcelVersion.Excel97to2003;
                else
                    workBook.Version = ExcelVersion.Excel2010;
                workBook.SaveAs(stream);
            }
 
            //Message box confirmation to view the created spreadsheet.
            if (MessageBox.Show("Do you want to view the workbook?", "Workbook has been created",
                                MessageBoxButton.YesNo, MessageBoxImage.Information) == MessageBoxResult.Yes)
            {
                //Launching the Excel file using the default Application.[MS Excel Or Free ExcelViewer]
                System.Diagnostics.Process.Start(sfd.FileName);
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}