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

namespace aboutdialog類(lèi)
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            // Create and display a modless about dialog box.
           Form2  about = new Form2 ();
            about.Show();

            // Draw a blue square on the form.
            /* NOTE: This is not a persistent object, it will no longer be
               * visible after the next call to OnPaint. To make it persistent, 
               * override the OnPaint method and draw the square there */
            Graphics g = about.CreateGraphics();
            g.FillRectangle(Brushes.Blue, 10, 10, 50, 50);

        }
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1 ());
        }
    }
}