How to use ' Pen ' object in C#.Net

How to draw the different shapes in c#.net using Pen object.....

////////////////////////   CODE   ////////////////////////

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace _121
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void panel1_Click(object sender, EventArgs e)
        {
            Pen p = new Pen(Color.Blue, 5);
            Graphics g = panel1.CreateGraphics();

            g.DrawRectangle(p,22,22,22,22);
        }
    }
}

/////////////////////   OUTPUT   /////////////////////////

--
/\/ir@\/ <(.'.)>