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  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Page1">
    
    

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.IO;
namespace WpfApplication1
{
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
            StreamWriter SW;
            SW = File.CreateText("c:\\s.txt");
            SW.WriteLine("A!");
            SW.WriteLine("B");
            SW.Close(); 
            
        }
    }
}