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 Form4 : Form
    {
        public Form4()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Graphics forDraw;
            forDraw = panel1.CreateGraphics();
            Pen p1 = new Pen(Color.Aqua, 20);
            Brush b1 = Brushes.Black;
            forDraw.DrawRectangle(p1, 100, 100, 500, 500);
            forDraw.FillRectangle(b1, 100, 100, 500, 500);
            forDraw = panel1.CreateGraphics();
            Pen p2 = new Pen(Color.Aqua, 20);
            Brush b2 = Brushes.Black;
            forDraw.DrawRectangle(p2, 98, 98, 490, 490);
            forDraw.FillRectangle(b2, 98, 98, 490, 490);
            forDraw = panel1.CreateGraphics();
            Pen p3 = new Pen(Color.Aqua, 20);
            Brush b3 = Brushes.Black;
            forDraw.DrawRectangle(p3, 96, 96, 480, 480);
            forDraw.FillRectangle(b3, 96, 96, 480, 480);
            forDraw = panel1.CreateGraphics();
            Pen p4 = new Pen(Color.Aqua, 20);
            Brush b4 = Brushes.Black;
            forDraw.DrawRectangle(p4, 94, 94, 470, 470);
            forDraw.FillRectangle(b4, 94, 94, 470, 470);
            forDraw = panel1.CreateGraphics();
            Pen p5 = new Pen(Color.Aqua, 20);
            Brush b5 = Brushes.Black;
            forDraw.DrawRectangle(p5, 92, 92, 460, 460);
            forDraw.FillRectangle(b5, 92, 92, 460, 460);
            forDraw = panel1.CreateGraphics();
            Pen p6 = new Pen(Color.Aqua, 20);
            Brush b6 = Brushes.Black;
            forDraw.DrawRectangle(p6, 90, 90, 450, 450);
            forDraw.FillRectangle(b6, 90, 90, 450, 450);
            forDraw = panel1.CreateGraphics();
            Pen p7 = new Pen(Color.Aqua, 20);
            Brush b7 = Brushes.Black;
            forDraw.DrawRectangle(p7, 88, 88, 440, 440);
            forDraw.FillRectangle(b7, 88, 88, 440, 440);
            forDraw = panel1.CreateGraphics();
            Pen p8 = new Pen(Color.Aqua, 20);
            Brush b8 = Brushes.Black;
            forDraw.DrawRectangle(p8, 86, 86, 430, 430);
            forDraw.FillRectangle(b8, 86, 86, 430, 430);
            forDraw = panel1.CreateGraphics();
            Pen p9 = new Pen(Color.Aqua, 20);
            Brush b9 = Brushes.Black;
            forDraw.DrawRectangle(p9, 84, 84, 420, 420);
            forDraw.FillRectangle(b9, 84, 84, 420, 420);
            forDraw = panel1.CreateGraphics();
            Pen p10 = new Pen(Color.Aqua, 20);
            Brush b10 = Brushes.Black;
            forDraw.DrawRectangle(p10, 82, 82, 410, 410);
            forDraw.FillRectangle(b10, 82, 82, 410, 410);
            forDraw = panel1.CreateGraphics();
            Pen p11 = new Pen(Color.Aqua, 20);
            Brush b11 = Brushes.Black;
            forDraw.DrawRectangle(p11, 80, 80, 400, 400);
            forDraw.FillRectangle(b11, 80, 80, 400, 400);
            forDraw = panel1.CreateGraphics();
            Pen p12 = new Pen(Color.Aqua, 20);
            Brush b12 = Brushes.Black;
            forDraw.DrawRectangle(p12, 78, 78, 390, 390);
            forDraw.FillRectangle(b12, 78, 78, 390, 390);
            forDraw = panel1.CreateGraphics();
            Pen p13 = new Pen(Color.Aqua, 20);
            Brush b13 = Brushes.Black;
            forDraw.DrawRectangle(p13, 76, 76, 380, 380);
            forDraw.FillRectangle(b13, 76, 76, 380, 380);
            forDraw = panel1.CreateGraphics();
            Pen p14 = new Pen(Color.Aqua, 20);
            Brush b14 = Brushes.Black;
            forDraw.DrawRectangle(p14, 74, 74, 370, 370);
            forDraw.FillRectangle(b14, 74, 74, 370, 370);
            forDraw = panel1.CreateGraphics();
            Pen p15 = new Pen(Color.Aqua, 20);
            Brush b15 = Brushes.Black;
            forDraw.DrawRectangle(p15, 72, 72, 360, 360);
            forDraw.FillRectangle(b15, 72, 72, 360, 360);
        }

    }
}