Web response(c#)

Question

Im making an application and I want that if the web response in my app show in a label Online, im triying to do it but I dont know how.

Answer 1

Try this which uses a CheckBox to provide a valid and invalid check

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Timers;
using System.Windows.Forms;



namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public delegate void OnStatusCheck(bool sender);
        public static event OnStatusCheck StatusCheckEvent;

        public Form1()
        {
            InitializeComponent();

            StatusCheckEvent += OnStatusCheckEvent;
            Shown += OnShown;
        }

        private void OnStatusCheckEvent(bool sender)
        {
            if (sender)
            {
                IsOnlineLabel.InvokeIfRequired(label => label.Text = "Online");
            }
            else
            {
                IsOnlineLabel.InvokeIfRequired(label => label.Text = "OffLine");
            }
        }

        private void OnShown(object sender, EventArgs e)
        {
            var timer = new System.Timers.Timer {Interval = 500, Enabled = true};
            timer.Elapsed += async (sender1, arguments) => 
                await timer_Elapsed(sender1, arguments);
        }

        private async Task timer_Elapsed(object sender, ElapsedEventArgs arguments)
        {
            var url = _causeFailure ? 
                "http://theip/players.json" : 
                "https://stackoverflow.com/";

            try
            {
                var request = (HttpWebRequest)WebRequest.Create(url);
                request.Method = "POST";
                await request.GetResponseAsync();
                StatusCheckEvent?.Invoke(true);
            }
            catch
            {
                StatusCheckEvent?.Invoke(false);
            }
        }

        private bool _causeFailure;
        private void CauseFailureCheckBox_CheckedChanged(object sender, EventArgs e)
        {
            _causeFailure = checkBox1.Checked;
        }
    }
    public static class Extensions
    {
        public static void InvokeIfRequired<T>(this T control, Action<T> action) where T : ISynchronizeInvoke
        {
            if (control.InvokeRequired)
            {
                control.Invoke(new Action(() => action(control)), null);
            }
            else
            {
                action(control);
            }
        }
    }

}

Answer 2

Try this, make sure to mark the method or event using this code with async modifier

try
{
    var request = (HttpWebRequest)WebRequest.Create("http://theip/players.json");
    request.Method = "POST";
    await request.GetResponseAsync();
    IsOnlineLabel.Text = "Online";
}
catch
{
    IsOnlineLabel.Text = "Off line";
}