private async Task LoadHorarios()
        {
            DBHorarioConnection db = new DBHorarioConnection();

            Variaveis._horario = new Horario[Variaveis._rows];

            for (int id = 1; id <= Variaveis._rows; id++)
            {
                String        idString   = id.ToString();
                Task <string> resultTask = db.PullHorario(idString);

                String result = await resultTask;

                if (result.Contains("success") && result.Contains("true"))
                {
                    var horario = JsonConvert.DeserializeObject <Horario>(result);


                    Variaveis._horario[id - 1] = horario;
                }

                else
                {
                    await DisplayAlert("Result", " Failed", "OK");
                }
            }
        }
        private async void LoadRows()
        {
            DBHorarioConnection db = new DBHorarioConnection();



            Task <string> resultTask = db.PullRowHorario();
            string        result     = await resultTask;

            Variaveis._rows = Int32.Parse(result);
        }