c# comboBox与数据库中的数据绑定

private void comBoxBinding()
        {
            SqlConnection connection = this.getConnection();
            connection.Open();
            SqlCommand command = new System.Data.SqlClient.SqlCommand();
            command = new SqlCommand("select State_Name_English,State_Name,StandSys,StandSys_English,StandSys_ID,State_ID from DbTable where StandSys_ID<>100 and isFinished='True' order by State_ID,StandSys_ID", connection);
            command.ExecuteNonQuery();
            SqlDataReader reader = command.ExecuteReader();
            if (reader.HasRows)
            {
                while (reader.Read())
                {
                    comboBox1.Items.Add(reader[].ToString());
                }
            }
            comboBox1.SelectedText = "中国(GB)";
            reader.Close();
            connection.Close();
        }