private void BtnDel_Click(object sender, EventArgs e)
        {
            ShowDialog(DATE_DIALOG);
        }

        protected override Dialog OnCreateDialog(int id)
        {
            switch (id)
            {
                case DATE_DIALOG:
                    {
                        return new DatePickerDialog(this, this, year, month, day);
                    }
                    break;

                case DATE_DIALOG2:
                    {
                        return new DatePickerDialog(this, this, anio, mes, dia);
                    }
                    break;
                default:
                    break;
            }
            return null;
        }

        public void OnDateSet(DatePicker view, int year, int month, int dayOfMonth)
        {
            this.year = year;
            this.month = month;
            this.day = dayOfMonth;
            Toast.MakeText(this, "Seleccionaste :" + (month + 1) + "/" + day + "/" + year, ToastLength.Short).Show();
            string Del = (year + "-" + (month + 1) + "-" + day).ToString();
            btnDel.Text = Del;
        }