How to export the grid to excel with formatted text in WinForms GridGroupingControl?

this.gridGroupingControl1.TableDescriptor.Columns["CategoryID"].Appearance.AnyRecordFieldCell.Format = "##.##";
 
private void btnExport_Click(object sender, EventArgs e)
{
   ExcelEngine engine = new ExcelEngine();
   IApplication app = engine.Excel.Application;
   IWorkbook book = app.Workbooks.Create();
   book.Version = ExcelVersion.Excel2013;
   app.DefaultVersion = ExcelVersion.Excel2013;
   IWorksheet sheets = book.Worksheets[0];
   ExcelExportingOptions options = new ExcelExportingOptions();
   excelConverter.ExportStyle = true;
   excelConverter.ExportMode = GridGroupingExcelConverterBase.ExportingMode.Text;
   excelConverter.ExportToExcel(this.gridGroupingControl1, sheets, options);
   book.SaveAs("Sample.xlsx");
   Process.Start("Sample.xlsx");
}

Me.gridGroupingControl1.TableDescriptor.Columns("CategoryID").Appearance.AnyRecordFieldCell.Format = "##.##"
 
Private Sub btnExport_Click(ByVal sender As Object, ByVal e As EventArgs)
   Dim engine As New ExcelEngine()
   Dim app As IApplication = engine.Excel.Application
   Dim book As IWorkbook = app.Workbooks.Create()
   book.Version = ExcelVersion.Excel2013
   app.DefaultVersion = ExcelVersion.Excel2013
   Dim sheets As IWorksheet = book.Worksheets(0)
   Dim options As New ExcelExportingOptions()
   excelConverter.ExportStyle = True
   excelConverter.ExportMode = GridGroupingExcelConverterBase.ExportingMode.Text
   excelConverter.ExportToExcel(Me.gridGroupingControl1, sheets, options)
   book.SaveAs("Sample.xlsx")
   Process.Start("Sample.xlsx")
End Sub