Windows Phone Download Save file to Isolated Storage (Application Storage)

Imports System.IO
Imports System.Text
Imports System.IO.IsolatedStorage

Partial Public Class MainPage
    Inherits PhoneApplicationPage

    ' Constructor
    Public Sub New()
        InitializeComponent()
    End Sub

    Dim client As WebClient
    Dim prog As ProgressIndicator
    Dim url As String

    Private Sub btnDownload_Click(sender As System.Object, e As System.Windows.RoutedEventArgs)

        Me.txtResult.Text = "Downloading..."

        client = New WebClient()
        url = "http://localhost/myphp/music.mp3"
        Dim uri As New Uri(url)

        AddHandler client.OpenReadCompleted, AddressOf client_OpenReadCompleted
        AddHandler client.DownloadProgressChanged, AddressOf client_DownloadProgressChanged
        client.OpenReadAsync(uri)

    End Sub

    Private Sub client_OpenReadCompleted(sender As Object, e As OpenReadCompletedEventArgs)
        If e.Cancelled = False AndAlso e.Error Is Nothing Then

            Dim strFileName As String = url.Substring(url.LastIndexOf("/") + 1, (url.Length - url.LastIndexOf("/") - 1))
            Dim isoStore As IsolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication() ' Path Storage

            '*** If File Exists 
            If isoStore.FileExists(strFileName) Then
                isoStore.DeleteFile(strFileName)
            End If

            Dim dataFile As New IsolatedStorageFileStream(strFileName, FileMode.CreateNew, isoStore)


            Dim fileLen As Long = e.Result.Length
            Dim b As Byte() = New Byte(fileLen - 1) {}
            e.Result.Read(b, 0, b.Length)
            dataFile.Write(b, 0, b.Length)
            dataFile.Flush()

            Dim lenghtOfFile = dataFile.Length

            Me.txtResult.Text = "Download Completed."

        End If
    End Sub

    Private Sub client_DownloadProgressChanged(sender As Object, e As DownloadProgressChangedEventArgs)
        Me.ProgressBar1.Value = e.ProgressPercentage
    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;

namespace PhoneApp
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
        }

        WebClient client;
        ProgressIndicator prog;
        string url;

        private void btnDownload_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            this.txtResult.Text = "Downloading...";
            client = new WebClient();
            url = "http://localhost/myphp/music.mp3";
            Uri uri = new Uri(url);
            client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
            client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);
            client.OpenReadAsync(uri);
        }

        private void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
            if (e.Cancelled == false && e.Error == null)
            {
                string strFileName = url.Substring(url.LastIndexOf("/") + 1, (url.Length - url.LastIndexOf("/") - 1));

                IsolatedStorageFile isoStore = IsolatedStorageFile.GetUserStoreForApplication();
                //  Path Storage
                // *** If File Exists 
                if (isoStore.FileExists(strFileName))
                {
                    isoStore.DeleteFile(strFileName);
                }
                IsolatedStorageFileStream dataFile = new IsolatedStorageFileStream(strFileName, FileMode.CreateNew, isoStore);
                long fileLen = e.Result.Length;
                byte[] b = new byte[fileLen];
                e.Result.Read(b, 0, b.Length);
                dataFile.Write(b, 0, b.Length);
                dataFile.Flush();
                object lenghtOfFile = dataFile.Length;
                this.txtResult.Text = "Download Completed.";
            }
        }

        private void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            this.ProgressBar1.Value = e.ProgressPercentage;
        }
    }

}