Simple async/await example in WPF

MainWindow.xaml

<Window x:Class="asyncawait.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:asyncawait"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="450">
    <DockPanel>
        <Button Name="buttonAsync"
                Content="Async Example"
                DockPanel.Dock="Top"
                Click="buttonAsync_Click" />
        <Button Name="buttonResponds"
                Content="UI still responds during background task"
                DockPanel.Dock="Top"
                Click="buttonResponds_Click" />
        <TextBox Name="textBoxResults"
                 DockPanel.Dock="Bottom"
                 Margin="0,20,0,0"
                 TextWrapping="Wrap"
                 FontFamily="Consolas"
                 AcceptsReturn="True" />
    </DockPanel>
</Window>

MainWindow.xaml.cs

using System.Threading;
using System.Threading.Tasks;
using System.Windows;

namespace asyncawait
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private async void buttonAsync_Click(object sender, RoutedEventArgs e)
        {
            buttonAsync.IsEnabled = false;

            var slowTask = Task.Run(() => SlowTask());

            textBoxResults.AppendText("Processing. The UI should continue to respond.\n");

            await slowTask;
        
            textBoxResults.AppendText(slowTask.Result.ToString());

            buttonAsync.IsEnabled = true;
        }

        private string SlowTask()
        {
            Thread.Sleep(5000);
            return "Work complete! Zug zug.\n";
        }

        private void buttonResponds_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("UI still works");
        }
    }
}