How Do I Make A Listbox Autoupdate/Refresh

DataSet st = new DataSet();
            string strConnectionString = "Data Source=JAMES-PC\\SQLEXPRESS;Initial Catalog=staff;Integrated Security=True";

            SqlConnection objconnection = new SqlConnection(strConnectionString);
            using (SqlCommand cmd = new SqlCommand("SELECT  [name] FROM [staff1]",
            objconnection))
            {
                using (SqlDataAdapter adapter = new SqlDataAdapter(cmd))
                {
                    adapter.Fill(st);
                }
            }

            var empList = st.Tables[0].AsEnumerable().Select(dataRow =>

            dataRow.Field<string>("name")).ToList();
            listBox1.DataSource = empList;

            listBox1.SelectedIndex = 0;
            listBox1.Refresh();

tried listBox1.Refresh(); almost everywhere , didnt help, 
also tried  public void RefreshItem2(int index)
            {
                RefreshItem(index);
            }