Executing Command Logic in a View Model

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Windows;

namespace RoutedCommandBindingSample
{
    /// <summary>
    /// Interaction logic for App.xaml
    /// </summary>
    public partial class App : Application
    {
        protected override void OnStartup(StartupEventArgs e)
        {
            base.OnStartup(e);

            var mainWindow = new MainWindow();
            var player = new SimpleMediaPlayer();
            player.SourceUri = "http://www.pure.fm/prog.m3u";
            mainWindow.DataContext = player;
            mainWindow.Show();
        }
    }
}