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

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

        //设置按钮为接受按钮
        private void Form1_Load(object sender, EventArgs e)
        {
            this.AcceptButton = button1;
        }

        //点击按钮添加控件
        private void button1_Click(object sender, EventArgs e)
        {
            ComboBox cbo = new ComboBox();  //创建控件的实例
            cbo.Location = new Point(20, 30);   //设置控件添加的位置
            this.Controls.Add(cbo); //当前窗体所包含的控件的集合要添加cbo这个控件
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
}