private async void Button_OnClicked(object sender, EventArgs e) { string currency = null; var selectedIndex = CurrencyPicker.SelectedIndex; if (selectedIndex != -1) { currency = CurrencyPicker.Items[selectedIndex]; } var amountInput = AmountEntry.Text; var amount = decimal.Parse(amountInput); var result = await ConvertManager.ConvertCurrency(currency, amount); await DisplayAlert("Success!", amount + " Bitcoins is: " + result.ToString(CultureInfo.InvariantCulture) + currency, "Close"); }