我想获取关于任何帐户的数据，但我再做一次，我得到一个错误，好像阅读器没有被再次创建，但旧的正在使用。

public static Account getAccount(string login)
        {
            using (MySqlConnection connection = new MySqlConnection(CONNECT_STR_ACCOUNTS))
            {
                connection.Open();
                MySqlCommand cmd = connection.CreateCommand();
                cmd.CommandText = "SELECT * FROM accounts WHERE " + COLUMN_LOGIN + "='" + login + "'";
                MySqlDataReader reader = cmd.ExecuteReader();

                Account account = null;

                reader.Read(); //Error is hear

                account = new Account(

                                reader[NUM_COL_FIRST_NAME].ToString(),
                                reader[NUM_COL_LAST_NAME].ToString(),
                                reader[NUM_COL_LOGIN].ToString(),
                                reader[NUM_COL_PASSWORD].ToString(),
                                Convert.ToInt32(reader[NUM_COL_LEVEL_ACCSES].ToString()),
                                reader[NUM_COLUMN_BIRHTDAY].ToString()

                );
                
                reader.Close();
                connection.Close();
                return account;
            }
        }