My First WPF App with code behind

   
  

<Window x:Class="MyFirstWPFApp.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MyFirstWPFApp" Height="336" Width="343">
  <Grid>      
      <Button Click="MyClickEvent" VerticalAlignment="Top" HorizontalAlignment="Left"
         Grid.Column="0" Grid.ColumnSpan="1" Grid.Row="0" Grid.RowSpan="1" Margin="43,61,0,0"
         Width="75" Height="23" Name="btnGo">
        Go
      </Button>

    </Grid>
  
</Window>
//File:Window.xaml.cs

using System;
using System.Collections.Generic;
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.Shapes;


namespace MyFirstWPFApp
{
    public partial class Window1 : System.Windows.Window
    {

        private void MyClickEvent(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("A!", "Message", MessageBoxButton.OK, MessageBoxImage.Hand);
        }

        public Window1()
        {
            InitializeComponent();
        }

    }
}