Windows Phone Create and Write Text File In Isolated Storage (Application Storage)

Imports System.IO
Imports System.IO.IsolatedStorage

Partial Public Class MainPage
    Inherits PhoneApplicationPage

    Private strFileName As String = "thaicreate.txt"

    ' Constructor
    Public Sub New()
        InitializeComponent()

        '*** for Create Text File ***'
        Dim isoStore As IsolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication()
        If Not isoStore.FileExists(strFileName) Then
            Dim dataFile As IsolatedStorageFileStream = isoStore.CreateFile(strFileName)
        End If

    End Sub


    Private Sub btnSave_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)
        '*** for Write Text File ***'
        Dim isoStore As IsolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication()
        Dim sw As New StreamWriter(New IsolatedStorageFileStream(strFileName, FileMode.Append, isoStore))
        sw.WriteLine(Me.txtMessage.Text)
        sw.Close()

        MessageBox.Show("Create and Save Completed.", "Result", MessageBoxButton.OK)

    End Sub

End Class

using System;
using System.Windows;
using System.Net;
using System.IO;
using System.Text;
using System.IO.IsolatedStorage;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using System.Collections.Generic;
using System.Windows.Controls;

namespace PhoneApp
{
    public partial class MainPage : PhoneApplicationPage
    {

        private string strFileName = "thaicreate.txt";
        // Constructor
        public MainPage()
        {
            InitializeComponent();

            //*** for Create Text File ***'
            IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();
            if (!isoStore.FileExists(strFileName))
            {
                IsolatedStorageFileStream dataFile = isoStore.CreateFile(strFileName);
            }

        }

        private void btnSave_Click(System.Object sender, System.Windows.RoutedEventArgs e)
        {
            //*** for Write Text File ***'
            IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();
            StreamWriter sw = new StreamWriter(new IsolatedStorageFileStream(strFileName, FileMode.Append, isoStore));
            sw.WriteLine(this.txtMessage.Text);
            sw.Close();

            MessageBox.Show("Create and Save Completed.", "Result", MessageBoxButton.OK);

        }


    }
}