public async Task <ActionResult <ClassroomViewModel> > PostClassroom(ClassroomViewModel classroom) { if (classroom != null) { try { await Task.Run(() => { classroom.DateCreated = DateTime.Now; _classroomService.Add(classroom); _classroomService.SaveChanges(); return(Ok("Thêm phòng học thành công!")); }); } catch { throw new Exception(string.Format("Lỗi khi thêm dữ liệu")); } } return(CreatedAtAction("GetReceiptType", new { id = classroom.Id }, classroom)); }