/Window1.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace PullMyFinger {
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();
        }

        private void DoFinger(object sender, RoutedEventArgs e) {
            Finger.GetAsync(Address.Text, delegate(string result) {
                Dispatcher.BeginInvoke(new Action(delegate {
                    Output.Text = result;
                }), new object[] { });
            });
        }

        private void AddressKeyDown(object sender, KeyEventArgs e) {
            if (e.Key == Key.Enter) {
                DoFinger(this, new RoutedEventArgs());
            }
        }
    }
}