How to export different data of two grids simultaneously into one excel sheet in WinForms GridGroupingControl?

private void export_Click(object sender, EventArgs e)
{
   SaveFileDialog saveFileDialog = new SaveFileDialog();
   saveFileDialog.Filter = "Files(*.XLS)|*.XLS";
   saveFileDialog.AddExtension = true;
   saveFileDialog.DefaultExt = ".XLS";
   this.gridGroupingControl1.ShowRowHeaders = false;
   // Export Grid to Excel
   GroupingGridExcelConverterControl converter = new GroupingGridExcelConverterControl();
   ExcelEngine Engine = new ExcelEngine();
   IWorkbook workbook = Engine.Excel.Workbooks.Create(1);
   IWorksheet sheet = workbook.Worksheets[0];
   sheet.Name = "sample";
   // Export GridGroupingcontrol 1 and 2 to excel sheet
   sheet.ImportDataTable(dt, true, 1, 1);
   sheet.ImportDataTable(dts, true, 1, 9);
   // save to workbook in excel
   workbook.SaveAs("Sample.xls");
   Process.Start("Sample.xls");
}

Private Sub export_Click (ByVal sender As Object, ByVal e As EventArgs) Handles export_Click
   Dim saveFileDialog As New SaveFileDialog()
   saveFileDialog.Filter = "Files(*.XLS)|*.XLS"
   saveFileDialog.AddExtension = True
   saveFileDialog.DefaultExt = ".XLS"
   Me.gridGroupingControl1.ShowRowHeaders = False
   ' Export Grid to Excel
   Dim converter As New GroupingGridExcelConverterControl()
   Dim Engine As New ExcelEngine()
   Dim workbook As IWorkbook = Engine.Excel.Workbooks.Create(1)
   Dim sheet As IWorksheet = workbook.Worksheets(0)
   sheet.Name = "sample"
   ' Export GridGroupingcontrol 1 and 2 to excel sheet
   sheet.ImportDataTable(dt, True, 1, 1)
   sheet.ImportDataTable(dts, True, 1, 9)
   ' save to workbook in excel
   workbook.SaveAs("Sample.xls")
   Process.Start("Sample.xls")
End Sub