public ActionResult <ApiResponse <CustomerProductResponse> > Get([FromQuery] string identificationNumber) { //Check identificationNumber Field if (string.IsNullOrEmpty(identificationNumber)) { return(BadRequest(new ApiResponse { Code = (int)ApiResponseCodes.ValidationError, ErrorMessage = "IdentificationNumber Required" })); } //Check IdentificationNo IsExist bool isExistCustomer = _customerRepository.FindFirstBy(p => p.IdentificationNumber.Equals(identificationNumber)).ResponseCode == (int)EntityResponseCodes.NoRecordFound; if (isExistCustomer) { return(BadRequest(new ApiResponse { Code = (int)ApiResponseCodes.ValidationError, ErrorMessage = " Identification Number Is Not Exist!" })); } var serviceEntityProductResponse = _customerProductRepository.GetSelectedProductsByIdentificationNumber(identificationNumber); if (serviceEntityProductResponse.ResponseCode == (int)Enums.EntityResponseCodes.Successfull) { return(Ok(new ApiResponse <IEnumerable <CustomerProductResponse> >((int)ApiResponseCodes.Ok, serviceEntityProductResponse.EntityDataList.Select(x => new CustomerProductResponse { ProductId = x.Product.ProductId, ProductName = x.Product.ProductName, Description = x.Product.Description, Price = x.Product.Price })))); } throw new ApiException((int)ApiResponseCodes.DbError, serviceEntityProductResponse.ResponseMessage); }