How to ping two pc connect through switch?

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I try to make a winform C# to ping two PC connect through switch.
I want to ping from PC A (server) to PC B (client). Check a connect alive.
PC A has IP = 192.168.1.100 and PC B has IP = 192.168.1.101
Here is my code:

C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Net.NetworkInformation;

namespace ping
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btn_ping_Click(object sender, EventArgs e)
        {
            Ping p = new Ping();
            PingReply r;
            String s = "192.168.1.101";
            try
            {
                r = p.Send(s);
                if (r.Status == IPStatus.Success)
                {
                    MessageBox.Show("ONLINE");
                }
            }
            catch
            {
                MessageBox.Show("OFFLINE");
            }
        }
    }
}

If two PC connect direct ( no switch between), my code run correct.
In case connect two PC with switch between, iif cable is not broken my code run correct. But if cable is broken, my code not work. It does not show message "OFFLINE".
What wrong whit it? And how can I fix it? Thanks for help.

Posted 29-Nov-14 21:50pm

Member 10390715

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2 solutions

Solution 2

using the following code :

C#

private static void Main(string[] args)
        {
            var p = new Ping();
            const string s = "192.168.1.101";
            try
            {
                var r = p.Send(s);
                Console.WriteLine(r.Status == IPStatus.Success ? "ONLINE" : "OFFLINE");
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
            }
        }

Posted 29-Nov-14 22:06pm

Member 10711013

Comments

Member 10390715 30-Nov-14 6:18am

Thanks for your help

Member 10711013 1-Dec-14 1:47am

your wilcome

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George Jonsson · Accepted Answer · 2014-11-29T22:01:00

Solution 1

Try to add an else statement in your code.

C#

if (r.Status == IPStatus.Success)
{
    MessageBox.Show("ONLINE");
}
else
{
    // Check if you end up here
}

However, I think the asynchronous ping might be a better approach for you.
You can find an example in MSDN: Ping Class[^]

Posted 29-Nov-14 22:01pm

George Jonsson

Comments

Member 10390715 30-Nov-14 6:17am

ok it work well, thanks for your help.

George Jonsson 30-Nov-14 8:01am

You are welcome.