テキストボックスの中身をUDPで送信するUWPアプリ

MainPage.xaml.cs

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.Networking.Sockets;
using Windows.Storage.Streams;
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;

// 空白ページの項目テンプレートについては、https://go.microsoft.com/fwlink/?LinkId=402352&clcid=0x411 を参照してください

namespace UDPSender
{
    /// <summary>
    /// それ自体で使用できる空白ページまたはフレーム内に移動できる空白ページ。
    /// </summary>
    public sealed partial class MainPage : Page
    {
        DatagramSocket socket = new DatagramSocket();
        string LOCAL_HOST = "127.0.0.1";
        string REMOTE_HOST = "192.168.180.112";
        int port = 3333;
        public MainPage()
        {
            this.InitializeComponent();
        }

        private async Task SendMessage(string message, string ip, int port)
        {
            using (var stream = await socket.GetOutputStreamAsync(new Windows.Networking.HostName(ip), port.ToString())){
                using (var writer = new DataWriter(stream)) {
                    var data = Encoding.UTF8.GetBytes(message);

                    writer.WriteBytes(data);
                    await writer.StoreAsync();
                }
            }
        }
        
        private async void Button_Click(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine(InputText.Text);
            await SendMessage(InputText.Text, LOCAL_HOST, port);

        }

        private async void Button_Click_1(object sender, RoutedEventArgs e)
        {
            Debug.WriteLine(InputText.Text);
            await SendMessage(InputText.Text, REMOTE_HOST, port);
        }
    }
}