using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public class Form1 : Form {
protected override void OnPaint(PaintEventArgs e) {
Graphics g = e.Graphics;
g.SmoothingMode = SmoothingMode.AntiAlias;
g.FillRectangle(Brushes.White, this.ClientRectangle);
Pen p = new Pen(Color.Black, 10);
p.LineJoin = LineJoin.Bevel;
e.Graphics.DrawRectangle(p, 20, 20, 60, 60);
p.Dispose();
}
public static void Main() {
Application.Run(new Form1());
}
}