WPF C# Tutorial

  x:Class="WpfApplication1.Window1"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  Title="Hello, WPF">
  Click me

//File:Window.xaml.cs
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 WpfApplication1{
  public partial class Window1 : Window {
    public Window1() {
      InitializeComponent();
    }
    void button_Click(object sender, RoutedEventArgs e) {
      MessageBox.Show("You", "Nice!");
    }
  }
}