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 Test1
{
    public partial class Form1 : Form
    {
        private Rectangle m_Rect;
 
        public Form1()
        {
            Point p = new Point(ClientRectangle.Width / 2 - 100 / 2,
            ClientRectangle.Height / 2 - 100 / 2);
            Size s = new Size(100, 100);
            m_Rect = new Rectangle(p, s);
 
 
            InitializeComponent();
            ResizeRedraw = true;
        }
 
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Brush b = new SolidBrush(Color.Red);
            Pen pen = new Pen(new SolidBrush(Color.Black));
 
            e.Graphics.DrawRectangle(pen, m_Rect);
            e.Graphics.FillRectangle(b, m_Rect);
        }
    }
}