//File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Input; namespace MyNameSpace.IncludeApplicationDefinition { public partial class MyWindow : Window { public MyWindow() { InitializeComponent(); } void ButtonOnClick(object sender, RoutedEventArgs args) { Button btn = sender as Button; MessageBox.Show(btn.Content + "' has been clicked."); } } }