Windows Phone -保存多个文件IsolatedStorage

我的应用程序，文件是从web服务器下载并保存在IsolatedStorage(与web文件同名)。所以，我想保存多个文件IsolatedStorage，从多个url。还有更好的方法吗?

private void sinc(object sender, EventArgs e)
    {
        client = new WebClient();
        url = "http://infassteste.url.ph/json.html";
        Uri uri = new Uri(url);
        client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
        client.OpenReadAsync(uri);
    }
    private void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
    {
        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, FileAccess.ReadWrite, FileShare.None, 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;
        MessageBox.Show("Arquivo salvo!");
    }