Listing 1

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Shapes;

namespace Demo
{
	/// <summary>
	/// Interaction logic for Window1.xaml
	/// </summary>

	public partial class Window1 : Window
	{
		public Window1()
		{
			InitializeComponent();
			this.MyButton.Click += new RoutedEventHandler
			   (MyClickHandler);
		}

		void MyClickHandler(object sender, RoutedEventArgs e)
		{
			MyButton.Content = "CLICKED";
		}

	}
}