private async Task GetContactsAsync()
        {
            var _restService = new RESTService();
            var result       = await _restService.GetClientsAsync();

            if (result.Item1 == true)
            {
                var json = result.Item2;

                if (DataStore.GetDataStoredJson("Contacts").ToList().Count > 0)
                {
                    DataStore.UpdateData("Contacts", json);
                }
                else
                {
                    var Data = new Stored_Data_Model
                    {
                        Type = "Contacts",
                        json = json
                    };
                    DataStore.AddData(Data);
                }
                UpdateContactsListview();
            }
            else
            {
                DependencyService.Get <IMessage>().ShortAlert(result.Item2);
            }
        }