Hi Wuyj,
Thank you for your interest in Syncfusion products.
If you want to save the GridGroupingControl exported excel file as .XLSX, you can specify the Worksheet version and excel engine version as 2013. Please make use of below code,
Code Snippet:
private void button1_Click(object sender, EventArgs e)
{
GroupingGridExcelConverterControl converter = new GroupingGridExcelConverterControl();
ExcelEngine excelEngine = new ExcelEngine();
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Excel2013;
IWorkbook chartBook = ExcelUtils.CreateWorkbook(1);
chartBook.Version = ExcelVersion.Excel2013;
IWorksheet sheet = chartBook.Worksheets[0];
converter.GroupingGridToExcel(this.gridGroupingControl1,sheet, ConverterOptions.Default);
chartBook.SaveAs("sample.xlsx");
Process.Start("sample.xlsx");
}
Sample:
http://www.syncfusion.com/downloads/support/directtrac/117867/Sample_Exporting95361951.zip
Please let me know if you have any concerns.
Regards,
Neelakandan