public Instrument (String nom,Photo photo, String description, String son)
 {
     this.nom = nom;
     this.photoInstrument = photo;
     this.description = description;
     this.son = son;
 }
        public async Task setAsyncPhotoToBD()
        {
            String urlPhoto = "http://t8.ulule.me/vox/528/comment-hacker-photo-profil-facebook-1.jpeg";

            var url = new Uri("http://webapiphone.azurewebsites.net/api/photos/RechercheIdMaxPhoto");

            HttpClient client = new HttpClient();
            var json = await client.GetStringAsync(url);
            List<int> idMaxPhoto = JsonConvert.DeserializeObject<List<int>>(json);

            idPhotoToAdd = idMaxPhoto[0] + 1;

            Photo photoToAdd = new Photo(idPhotoToAdd, urlPhoto);
            var urlString = new Uri("http://webapiphone.azurewebsites.net/api/photos/InsererPhoto");
            client = new HttpClient();
            await client.PostAsJsonAsync<Photo>(urlString, photoToAdd);
        }