static class Program
    {
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Form1 frm = new Form1();
            frm.KeyPress += new KeyPressEventHandler(new KeyPressCode().keypressEvent);
            Application.Run(frm);
        }
    }

    public class KeyPressCode
    {
        public void keypressEvent(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == (char)Keys.Escape)
            {
                MessageBox.Show("Key ESCAPE pressed.");
            }
        }
    }