Anonymous

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

namespace Project02
{

    public partial class Hw2 : Form
    {
        private bool _btnclickme1 = false;

        public Hw2()
        {
            InitializeComponent();
           
        }

    
        private void btn1_Click(object sender, EventArgs e)
        {
            _btnclickme1 = true;
            pbx1.Invalidate();

        }
        private void pbx1_Paint(object sender, PaintEventArgs e)
        {
            Graphics paper;
            paper = pbx1.CreateGraphics();
            Pen sharpie = new Pen(Color.Black);
            if (_btnclickme1)
            {
              
                paper.DrawRectangle(sharpie, 10, 10, 100, 100);
            }
        }

     }
}