Draw a rectangle code doesn't work please help me!!

Hi,

I have this code. I need to draw a rectangle but i can't get it drawn onto the screen.
Can anybode help me?

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 WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Graphics g = this.CreateGraphics();
            Pen pen = new Pen(Color.Black, 3);
            g.DrawRectangle(pen, 1, 1, 10, 10);

            
        }

        
        
    }
}