private async Task LoadExames()
        {
            DBExamesConnection db = new DBExamesConnection();

            Variaveis._exames = new Exames[Variaveis._rows4];

            for (int id = 1; id <= Variaveis._rows4; id++)
            {
                String        idString   = id.ToString();
                Task <string> resultTask = db.PullExames(idString);

                String result = await resultTask;

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


                    Variaveis._exames[id - 1] = exame;
                }

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



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

            Variaveis._rows4 = Int32.Parse(result);
        }