在程式殿堂不斷學習的小菜鳥

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

using System.Data.SqlClient;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            using (SqlConnection cn = new SqlConnection("資料庫連線字串"))
            {
                cn.Open();
                using (SqlCommand cmd = new SqlCommand())
                {
                    cmd.Connection = cn;
                    cmd.CommandText = "SELECT 欄位一, 欄位二 FROM 資料表 ";
                    using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                    {
                        DataTable dt = new DataTable();
                        da.Fill(dt);
                        this.comboBox1.DisplayMember = "欄位一";
                        this.comboBox1.ValueMember = "欄位二";
                        this.comboBox1.DataSource = dt;

                        comboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
                        comboBox1.AutoCompleteSource = AutoCompleteSource.ListItems;
                        comboBox1.Focus();
                    }
                }
            }
        }
    }
}