<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"> <Grid> <Button Height="23" Margin="12,12,0,0" Name="button1" VerticalAlignment="Top" HorizontalAlignment="Left" Width="76" Click="button1_Click">Button</Button> <TextBlock FontSize="16" Name="textBlock1" VerticalAlignment="Center" HorizontalAlignment="Center" xml:space="preserve"><Bold>Goodbye</Bold> world, <Rectangle Width="20" Height="20" Fill="Blue"/> hello <Italic>Mars!</Italic></TextBlock> </Grid> </Window> //File:Window.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 WpfApplication1 { public partial class Window1 : Window { public Window1() { InitializeComponent(); } private void button1_Click(object sender, RoutedEventArgs e) { MessageBox.Show("Please don’t click this button again"); } } }