<span style="font-size:14px;">using System;
using System.Collections.Generic;
using System.Windows;

namespace WpfTutorialSamples
{
        public partial class App : Application
        {

                private void Application_Startup(object sender, StartupEventArgs e)
                {
                        // Create the startup window
                        MainWindow wnd = new MainWindow();
                        // Do stuff here, e.g. to the window
                        wnd.Title = "Something else";
                        // Show the window
                        wnd.Show();
                }
        }
}</span>