public async void LoadResults(string siteUrl, string keywords, string login, string mdp)
        {
            ObservableCollection<CortanaItem> cortanaResults = new ObservableCollection<CortanaItem>();

            keywords = keywords.Trim('.').ToLower();

            try
            {

                CortanaItem ci = new CortanaItem();
                ci.Id = "1";
                ci.Title = "Titre élément";
                ci.LastModifiedDate = DateTime.Now.ToString();
                ci.Url = "http://www.cellenza.com";
                cortanaResults.Add(ci);

                LoadDataCompleted(cortanaResults); // Fire event DataLoadCompleted

            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine("Erreur : " + ex.Message);
                LoadDataCompleted(null);
            }
        }
        public async void LoadItems(string siteUrl, string listName, string login, string mdp)
        {
            ObservableCollection<CortanaItem> cortanaItems = new ObservableCollection<CortanaItem>();

            try
            {
                CortanaItem ci = new CortanaItem();
                ci.Id = "1";
                ci.Title = "Titre élément";
                ci.LastModifiedDate = DateTime.Now.ToString();
                ci.Url = "http://www.google.fr";
                cortanaItems.Add(ci);
                LoadDataCompleted(cortanaItems); // Fire event DataLoadCompleted

            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine("Erreur : " + ex.Message);
                LoadDataCompleted(null);
            }
        }