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: Page.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.IO;
using System.IO.IsolatedStorage;
using System.Windows.Browser;
namespace SilverlightApplication3
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void myButton_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile isoFile = IsolatedStorageFile.GetUserStoreForApplication())                       
            {
                if (isoFile.FileExists("file1.txt"))
                    isoFile.DeleteFile("file1.txt");
                using (IsolatedStorageFileStream stream = new IsolatedStorageFileStream("file1.txt", FileMode.Create, isoFile)) 
                {
                    using (StreamWriter writer = new StreamWriter(stream))               
                    {                                                                    
                        writer.Write("Hello, from the isolated storage area!");             
                    }                    
                }
            }
            HtmlWindow window = HtmlPage.Window;
            window.Alert("File written!");
        }
    }
}