public override void BtnConvert_Click(object sender, EventArgs e)
        {
            var fromUnit = (TimeUnits)base.FromUnitType;
            var toUnit   = (TimeUnits)base.ToUnitType;

            var conv = new TimeConversions(fromUnit, toUnit);

            EditText etFrom = SV.FindViewById <EditText>(Resource.Id.et_from_prompt);

            if (etFrom.Text != null)
            {
                double from    = Convert.ToDouble(etFrom.Text);
                double toValue = conv.GetConversionResult(from);

                EditText etTo = SV.FindViewById <EditText>(Resource.Id.et_to_prompt);
                etTo.SetText(toValue.ToString(), TextView.BufferType.Normal);
            }
        }