Windows Store App and HTTP Upload to to Server (C#)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Devices.Geolocation;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Core;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;

using System.Net.Http;
using Windows.UI.Xaml.Media.Imaging;
using Windows.Storage;
using Windows.Storage.AccessCache;
using Windows.Storage.Pickers;


// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace WindowsStoreApps
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    /// 

    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private StorageFile fileSelect = null;

        private async void btnSelectfile_Click(object sender, RoutedEventArgs e)
        {
            FileOpenPicker picker = new FileOpenPicker();
            picker.FileTypeFilter.Add(".png");
            picker.FileTypeFilter.Add(".jpg");
            picker.FileTypeFilter.Add(".gif");
            picker.FileTypeFilter.Add(".bmp");
            picker.SuggestedStartLocation = PickerLocationId.Desktop;
            picker.ViewMode = PickerViewMode.Thumbnail;
            fileSelect = await picker.PickSingleFileAsync();

            if (fileSelect != null)
            {
                string fileName = fileSelect.Name;

                Windows.Storage.Streams.IRandomAccessStream stream = await fileSelect.OpenReadAsync();
                BitmapImage bitmapImage = new BitmapImage();
                bitmapImage.SetSource(stream);
                this.imgView.Source = bitmapImage;

            }
        }

        private async void btnUpload_Click(object sender, RoutedEventArgs e)
        {
            HttpClient http = new System.Net.Http.HttpClient();
            var randomStream = await fileSelect.OpenReadAsync();
            var stream = randomStream.AsStream();
            var content = new StreamContent(stream);

            String url = string.Format("http://localhost/myweb/upload.php?name={0}",fileSelect.Name);

            HttpResponseMessage response = await http.PostAsync(url,content);
            response.EnsureSuccessStatusCode();


            string result = string.Empty;
            result = await response.Content.ReadAsStringAsync();

            this.lblResult.Text = result;
        }
       
    }
}