csharp: using OleDb Getting the identity of the most recently added record

/// <summary>
        /// 执行SQL语句，返回影响的记录数
        /// </summary>
        /// <param name="SQLString">SQL语句</param>
        /// <returns>影响的记录数</returns>
        public static int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)
        {
            using (OleDbConnection connection = new OleDbConnection(connectionString))
            {
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.OleDb.OleDbException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }
        /// <summary>
        ///  添加返迴ID值
        ///  涂聚文 2014-12-29
        ///  Geovin Du
        /// 參考：  http://www.mikesdotnetting.com/article/54/getting-the-identity-of-the-most-recently-added-record
        /// http://stackoverflow.com/questions/186544/identity-after-insert-statement-always-returns-0
        /// </summary>
        /// <param name="SQLString"></param>
        /// <param name="identity"></param>
        /// <param name="cmdParms"></param>
        /// <returns></returns>
        public static int ExecuteSql(string SQLString, out int identity, params OleDbParameter[] cmdParms)
        {
           
            using (OleDbConnection connection = new OleDbConnection(connectionString))
            {
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    try
                    {
                        PrepareCommand(cmd, connection, null, SQLString, cmdParms);
                        int rows = cmd.ExecuteNonQuery();
                        cmd.CommandText = "Select @@Identity";
                        identity = (int)cmd.ExecuteScalar();
                        cmd.Parameters.Clear();
                        return rows;
                    }
                    catch (System.Data.OleDb.OleDbException E)
                    {
                        throw new Exception(E.Message);
                    }
                }
            }
        }