public async Task <IHttpActionResult> Post(WordTranslationImportModel wordtranslation) { if (wordtranslation == null) { throw new ArgumentNullException("word translation model can't be empty"); } if (wordTranslationService.Exists(wordtranslation.OriginalWordId, wordtranslation.TranslationWordId) == 0) { int res = await wordTranslationService.AddAsync(wordtranslation); return(Ok(res.ToString())); } else { return(BadRequest("Such wordtranslation exists")); } }