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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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 ProgrammingKnowledgeTuto1
{
    /// <summary>
    /// Lógica de interacción para MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void btn_1_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Hello World","Test");
        }
    }
}

<Window x:Class="ProgrammingKnowledgeTuto1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button Name="btn_1"
                Content="Test" 
                HorizontalAlignment="Left" 
                Margin="10,10,0,0" 
                VerticalAlignment="Top" 
                Width="75" 
                Click="btn_1_Click" 
                Background="#FF32901C" 
                Foreground="White"/>
    </Grid>
</Window>