private void OnCurrencyChanged(object sender, SelectionChangedEventArgs e)
{
TextRate.Text = "";
string currency = (string)ComboBoxCurrency.SelectedItem;
if (currency == "USD")
{
return;
}
System.Windows.Threading.Dispatcher dispatcher = this.Dispatcher;
ExchangeRates rates = this.serviceProvider.GetService(typeof(ExchangeRates)) as ExchangeRates;
if (rates != null)
{
rates.Enqueue(currency);
}
UpdateRateText();
}