public async Task <Response> AddSubject(Course course, Subject subject) { Response response = new Response(); try { ValidationResult validationResponse = await new SubjectValidator().ValidateAsync(subject); if (!validationResponse.IsValid) { response.Success = false; response.ErrorList.Add("Validation Error"); return(response); } response = await _repository.AddSubject(course, subject); return(response); } catch (Exception e) { StringBuilder sb = new StringBuilder(); log.Error(sb.AppendLine(e.Message).AppendLine(e.StackTrace).ToString()); response.Success = false; response.ErrorList.Add("Error while adding sybject to Course."); return(response); } }