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

    private void Form1_Load(object sender, EventArgs e)
    {
        //Retriving IP global properties
        IPGlobalProperties IPGproperties = IPGlobalProperties.GetIPGlobalProperties();

        //Retriving the TCP connections
        TcpConnectionInformation[] connections = IPGproperties.GetActiveTcpConnections();
        
        foreach (TcpConnectionInformation tcp in connections)
        {
            //Displaying TCP connection informations
            StringBuilder sb = new StringBuilder();
            sb.Append("Local endpoint:\t"+tcp.LocalEndPoint.Address.ToString());
            sb.Append("\nRemote endpoint:\t"+ tcp.RemoteEndPoint.Address.ToString());
            sb.Append("\nState:\t\t"+ tcp.State.ToString());
            MessageBox.Show(sb.ToString(),"TCP connection status");
        }

    }
}