C#

public Form1()
  {
      InitializeComponent();
  }

  private void Form1_Load(object sender, EventArgs e)
  {
      IPAddress[] localip = Dns.GetHostAddresses(Dns.GetHostName());
      foreach (IPAddress address in localip)
      {
          if (address.AddressFamily == AddressFamily.InterNetwork)
          {
              textBox1.Text = address.ToString();
              textBox2.Text = "8888";
          }
      }
  }

  private void button1_Click(object sender, EventArgs e)
  {
      TcpListener listenner = new TcpListener(IPAddress.Any, int.Parse(textBox2.Text));
      listenner.Start();
      tcpclient = listenner.AcceptTcpClient();

  }

class Program 
{
    delegate int GimmeTwoInts(int x, int y);

    static void Main(string[] args) 
    {
        ///Anonymous 
        GimmeTwoInts addThemUp = delegate(int x, int y) 
{ return x + y; };
        Console.WriteLine(addThemUp(5, 5));
                  ///Output => 10

        ///Lambda
        GimmeTwoInts addAgain = (c, d) => { return c + d; };
        Console.WriteLine(addAgain(10, 10));
                  ///Output => 20

        ///Static
        Console.WriteLine(Program.AddingMachine(20, 20));
                  ///Output => 40

        Console.ReadLine();
    }

    public static int AddingMachine(int f, int g)
    {
         return f + g;
    }
}