using Microsoft.Win32;

using System.Net;

using System.Net.Sockets;

using System.Net.NetworkInformation;

using System.Runtime;

​

namespace Nysus

{

​

    public partial class Form1 : Form

    {

​

        public Form1()

        {

​

            InitializeComponent();

        }

        //create the extern function

        [DllImport("winnet.dll")]

        private extern static bool InternetGetConnectedState(out int Description, int ReservedvValue);

        // Create a function that can use API

        public static bool IsConnected()

        {

            int Desc;

            return InternetGetConnectedState(out Desc, 0);

​

        }

​

        if (IsConnected)

        {

        }

        else{ MessageBox.Show("False");}

    }

}