Operation is not valid due to the current state of the object.

Question

Hi,

Why i am getting this error:

Operation is not valid due to the current state of the object.

Here is my code:

public async void PingAsync()
{
    LabelRoundTrip.Text = "Pinging…";

    Ping ping = new Ping();
    PingReply pingReply = await ping.SendPingAsync("yahoo.com");

    LabelRoundTrip.Text = pingReply.Status.ToString();
}

Thanks,
Jassim

Answer 1

Firs thing wrong, public async void PingAsync() is using void see my code.

This works for me, give it a try.

using System.Net.NetworkInformation;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Standard1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            LabelRoundTrip.Text = @"Pinging…";
        }

        private async Task<string> PingTask()
        {

            var ping = new Ping();
            PingReply pingReply = await ping.SendPingAsync("yahoo.com");

            return  pingReply.Status.ToString();

        }

        private async void button1_Click(object sender, System.EventArgs e)
        {
            LabelRoundTrip.Text = @"Pinging…";
            var results = await PingTask();
            LabelRoundTrip.Text = results;
        }
    }
}