Windows Store App and HTTP Post or Get Method to URL (C#)

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

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

                this.lblResult.Text = result;

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)
        {

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

                //this.lblStatus.Text = response.StatusCode + " " + response.ReasonPhrase + Environment.NewLine;
                string result = string.Empty;
                result = await response.Content.ReadAsStringAsync();

                this.lblResult.Text = result;

            }
            catch (HttpRequestException hre)
            {
                //this.lblStatus.Text = hre.ToString();
            }
            catch (Exception ex)
            {
                // For debugging
                //this.lblStatus.Text = ex.ToString();
            }

        }
       
    }
}

                HttpClient http = new System.Net.Http.HttpClient();
                var content = new FormUrlEncodedContent(new[] 
                    {
                        new KeyValuePair<string, string>("pName", this.txtName.Text),
                        new KeyValuePair<string, string>("pSurname",this.txtSurname.Text)
                    });

                HttpResponseMessage response = await http.PostAsync(this.txtURL.Text, content);

<?php
	echo " Sawatdee : ".$_POST["pName"]." ".$_POST["pSurname"];
?>

<Page
    x:Class="WindowsStoreApps.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WindowsStoreApps"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">


    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">

        <TextBox x:Name="txtURL" HorizontalAlignment="Left" Margin="105,114,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="658" FontSize="30" Height="53" FontFamily="Global User Interface"/>

        <Button x:Name="btnSubmit" Content="Submit" HorizontalAlignment="Left" Margin="788,111,0,0" VerticalAlignment="Top" FontSize="30" Click="btnSubmit_Click"/>

        <TextBlock x:Name="lblName" HorizontalAlignment="Left" Margin="110,193,0,0" TextWrapping="Wrap" Text="Name" FontSize="30" VerticalAlignment="Top"/>

        <TextBox x:Name="txtName" HorizontalAlignment="Left" Margin="200,184,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="169" FontSize="30" Height="53" FontFamily="Global User Interface"/>

        <TextBlock x:Name="lblSurname" HorizontalAlignment="Left" Margin="380,191,0,0" TextWrapping="Wrap" Text="Surname" FontSize="30" VerticalAlignment="Top" RenderTransformOrigin="3.849,-0.838"/>

        <TextBox x:Name="txtSurname" HorizontalAlignment="Left" Margin="510,181,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="253" FontSize="30" Height="53" FontFamily="Global User Interface"/>

        <TextBlock x:Name="lblResult" HorizontalAlignment="Left" Margin="106,276,0,0" TextWrapping="Wrap" Text="Result" FontSize="30" VerticalAlignment="Top"/>

    </Grid>

</Page>