public ActionResult <object> DeleteExam([FromBody] Model.DeleteExam delExam) { Init(); if (!ModelState.IsValid) { Response.StatusCode = 400; return("Exam does not exist"); } else { if (delExam.studentTermRegisterID == null) { Response.StatusCode = 400; return("Exam does not exist"); } StringBuilder sbError = new StringBuilder(""); List <Guid> list = new List <Guid>(); list.Add(delExam.studentTermRegisterID); int numberDeleted = 0; var isDeleted = _examService.Delete(list, delExam.teacherClassSubjectID, ref numberDeleted, ref sbError); if (!isDeleted) { Response.StatusCode = 400; return("Exam Delete failed"); } else { Response.StatusCode = 200; return((string)"Exam Deleted Successfully"); } } }