is it possible to have data form a table shown in a list box?

using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Linq;
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)
        {
            DataSet Ds = new DataSet();
          

            string strConnectionString = "Data Source=localhost,3601;Network   
            Library=DBMSSOCN;Initial Catalog=empdb;User ID=myusername;Password=mypwd;";
            SqlConnection objconnection = new SqlConnection(strConnectionString);
            using (SqlCommand cmd = new SqlCommand("SELECT  [empcode] FROM [empdb]", 
            objconnection))
            {
                using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))
                {
                    adapter.Fill(Ds);
                }
            }

            var empList = Ds.Tables[0].AsEnumerable().Select(dataRow =>      
            dataRow.Field<int>("empcode")).ToList();
            comboBox1.DropDownStyle = ComboBoxStyle.DropDownList;
            comboBox1.DataSource = empList;

          
            comboBox1.SelectedIndex = 0;
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            textBox1.Text = comboBox1.SelectedItem.ToString();
        }

      
           
    }
}