winform

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

using System.Data;
using System.Data.SqlClient;

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

        private void button1_Click(object sender, EventArgs e)
        {
            // 清理listBox1
            listBox1.Items.Clear();

            //从数据库Employee中读取教师名字存储到listBox1
            BindDataWithListbox();
        }

        //从数据库Employee中读取教师名字存储到listBox1
        private void BindDataWithListbox()
        {
            // 连接数据库的字符串
            string selectConnectionString = "Server = 192.0.0.1; DataBase = DuanLaoYeDataBase; UID = DuanLaoYe; PWD = 123456";
            // 执行查询Employee表的T-SQL语句
            string selectCommandText = "select * from Employee";
            //创建适配器 : 适配器会自动打开和关闭适配器自己打开的数据库连接
            using( SqlDataAdapter sda= new SqlDataAdapter(selectCommandText, selectConnectionString) )
            {
                // 在内存中创建数据表
                DataTable dt = new DataTable();

                // 将适配器读取到的结果集存储到DataTable中
                sda.Fill(dt);

                // 方法1 : 绑定数据源: 从DataTable表中获取
                listBox1.DataSource = dt;
                listBox1.DisplayMember = "Emp_Name";    // Employee表的Emp_Name字段名
                listBox1.ValueMember = "Emp_ID";             //  Employee表的Emp_ID字段名

                /***********************************************************************
                 * 方法2:              
                listBox1.BeginUpdate();
                foreach(DataRow dr in dt.Rows)
                {
                    listBox1.Items.Add(dr[1].ToString().Trim());
                }
                listBox1.EndUpdate();
                ***********************************************************************/

            }
        }
    }
}