public IActionResult OnPost(string stDate = "", string endDate = "") { if (!ModelState.IsValid && _orderServices.isExistcode(Discount.Discountcode)) { return(Page()); } if (stDate != "") { string[] std = stDate.Split('/'); Discount.StartDate = new DateTime(int.Parse(std[0]), int.Parse(std[1]), int.Parse(std[2]), new PersianCalendar() ); } if (endDate != "") { string[] end = endDate.Split('/'); Discount.EndDate = new DateTime(int.Parse(end[0]), int.Parse(end[1]), int.Parse(end[2]), new PersianCalendar() ); } _orderServices.Adddiscont(Discount); return(RedirectToPage("Index")); }