UI With Page for Dynamic Button content

   
  



<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";
        }
    }
}