Windows Store App and Connect to localhost Server (C#)

using System.Net.Http;

            HttpClient http = new System.Net.Http.HttpClient();
            HttpResponseMessage response = await http.GetAsync("http://localhost/myweb/index.php");
            response.EnsureSuccessStatusCode();

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

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;

// 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 async void btnSubmit_Click(object sender, RoutedEventArgs e)
        {

            HttpClient http = new System.Net.Http.HttpClient();
            HttpResponseMessage response = await http.GetAsync(this.txtURL.Text);
            response.EnsureSuccessStatusCode();

            //lblResult.Text = response.StatusCode + " " + response.ReasonPhrase + Environment.NewLine;
            string result = string.Empty;
            string result = await response.Content.ReadAsStringAsync();
            result = result.Replace("<br>", Environment.NewLine); // Insert new lines

            this.lblResult.Text = result;

        }
 
    }
}