How to hide certain columns and lock or unlock columns while exporting WinForms GridGroupingControl to Excel?

ExcelEngine engine = new ExcelEngine();
IApplication app = engine.Excel.Application;
app.DefaultVersion = ExcelVersion.Excel2010;
IWorkbook book = app.Workbooks.Create();
IWorksheet sheet = book.Worksheets[0];
excelConverter.GroupingGridToExcel(this.gridGroupingControl1, sheet, ConverterOptions.Default);

// Hides the Column index "2".
sheet.ShowColumn(2, false);

// Locks the cell range B12
sheet.Range["B12"].CellStyle.Locked = true;

// Unlocks the cell range A2
sheet.Range["A2"].CellStyle.Locked = false;
book.SaveAs(this.saveFileDialog1.FileName);
System.Diagnostics.Process proc = new System.Diagnostics.Process();
proc.StartInfo.FileName = this.saveFileDialog1.FileName;
proc.Start();

Dim engine As New ExcelEngine()
Dim app As IApplication = engine.Excel.Application
app.DefaultVersion = ExcelVersion.Excel2010
Dim book As IWorkbook = app.Workbooks.Create()
Dim sheet As IWorksheet = book.Worksheets(0)
excelConverter.GroupingGridToExcel(Me.gridGroupingControl1, sheet, ConverterOptions.Default)

' Hides the Column index "2".
sheet.ShowColumn(2, False)

' Locks the cell range B12
sheet.Range("B12").CellStyle.Locked = True

' Unlocks the cell range A2
sheet.Range("A2").CellStyle.Locked = False
book.SaveAs(Me.saveFileDialog1.FileName)
Dim proc As New System.Diagnostics.Process()
proc.StartInfo.FileName = Me.saveFileDialog1.FileName
proc.Start()