C# Checking Online Availability with IP and Port

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using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Net.Sockets;

namespace CSharpCheckingOnlineAvailabilityIPPort

{

  public partial class Form1 : Form

  {

  public Form1()

  {

  InitializeComponent();

  }

  private void btn_CheckServer_Click(object sender, EventArgs e)

  {

  TcpClient logonServer = new TcpClient();

  try

  {

  logonServer.Connect("127.0.0.1", 80); //this is just your loop back and checking to see if port 80 is open swap out for whatever you want

  }

  catch (Exception ex)

  {

   

  }

  if (logonServer.Connected)

  this.Text = "Connected";

  else

  this.Text = "Not connected";

  logonServer.Close();

   

  }

  }

}

Source Code