public ExamModel InsertExam(ExamModel model)
        {
            //if (model.Shift != null && model.ShiftId == 0)
            //{
            //  model.Shift.CreatedById = model.CreatedById;
            //  model.Shift.CreatedDate = model.CreatedDate;
            //  model.Shift.LastModifiedById = model.LastModifiedById;
            //  model.Shift.LastModifiedDate = model.LastModifiedDate;
            //  var shift = _shifts.InsertShift(model.Shift);
            //  model.ShiftId = shift.Id;
            //}

            var inserted = _repo.Insert(model);

            return(GetExam(inserted.Id));
        }