<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:Class="QuickStart4.Page1"> <StackPanel> <Button HorizontalAlignment="Left" Width="100" Margin="10,10,10,10" Click="HandleClick" Name="Button1">Click Me</Button> </StackPanel> </Page> //File:Page1.xaml.cs using System; using System.Windows; using System.Windows.Controls; namespace QuickStart4 { public partial class Page1 : Page { void HandleClick(object sender, RoutedEventArgs e) { Button1.Content = "Hello World"; } } }