public IActionResult OnPostCreateExcel()
{
var excel = new Excel(new SimpleExcelConfig());
var dbToExcel = new DbToExcel(_context);
excel.CreateStartExcel(dbToExcel.CreateGroupInfos());
excel.AddCouplesToExcel(dbToExcel.CreateCoupleInfos(false), dbToExcel.CreateGroupInfos());
var fs = new FileStream(excel._excelFileTmpPath.FullName, FileMode.Open, FileAccess.Read);
return(File(fs, "application/msexcel", "Raspisanue.xlsx"));
//return RedirectToPage("./Index");
}