<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ButtonClick" Height="300" Width="300"> <Grid HorizontalAlignment="Center" VerticalAlignment="Center"> <Button Click="ButtonClicked">Button</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 WpfApplication1 { public partial class Window1 : System.Windows.Window { public Window1() { InitializeComponent(); } void ButtonClicked(object sender, RoutedEventArgs e) { MessageBox.Show("Button was clicked"); } } }