Data Silverlight

    xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation' 
    xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
    xmlns:d='http://schemas.microsoft.com/expression/blend/2008' 
    xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006' 
    mc:Ignorable='d' 
    d:DesignWidth='640' 
    d:DesignHeight='480'>
    
    

//File:Window.xaml.cs
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.IO;
namespace SilverlightApplication3
{    
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            StreamWriter SW;
            SW = File.CreateText("c:\\s.txt");
            SW.WriteLine("A!");
            SW.WriteLine("B");
            SW.Close(); 
            
        }
    }
}