编写一个窗体

using System;
using System.Windows.Forms;

namespace test
{
    static class program
    {
        [STAThread]
        public static void Main()
        {
            Console.Write("HI");
            Application.Run(new form());
        }
     }

     class form:Form
    {    
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
        public form()
        {
            init();
        }

        private void init()
        {
            button1.Text="hi";
            this.Controls.Add(this.button1);

             this.button1.Click += new System.EventHandler(this.qq);
        }

        private void qq(object sender, EventArgs e)
        {
            MessageBox.Show("HI");
        }

    }
}

在命令行编译运行
C:/>csc.exe  --.cs )
C:/>--