通过设置窗体的AcceptButton属性，可以设置窗体的“接受”按钮，若此设计，则用户每次按下Enter键都相当于单击该按钮

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

namespace Test02
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            this.AcceptButton = button1;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("引发了接受按钮");
        }
    }
}