Xaml and Code behind

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<Window
  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">
  <Button x:Name="button" Width="200" Height="25" Click="button_Click">Click me</Button>
</Window>



//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!");
    }
  }
}