Deadlock example with async/await

gistfile1.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

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

            var run = new Button();
            run.Content = "Run!";
            run.Click += Run_Click;
            Content = run;
        }
        async Task Run()
        {
            var runningTask = Task.Delay(2000);
            await runningTask;

            MessageBox.Show("Hey!");
        }
        void Run_Click(object sender, RoutedEventArgs e)
        {
            Run().Wait();
        }
    }
}