调试易

IBatisNet Update问题请教.想实现点击Button1更新指定ID的用户的姓和名.按以下方法为何无法更新?改如何修改?谢谢!!!1.Person.xml配置:
 <update id="UpdatePer" parameterClass ="int" resultClass="Person">
      <![CDATA[ update person set
      PER_FIRST_NAME =#FIRSTNAME#,
      PER_Last_NAME =#LASTNAME#
      where
      PER_ID = #ID#　]]>
    </update>
2.Button1_Click事件:
 protected void Button1_Click(object sender, EventArgs e)
        {
            Mapper.Instance().BeginTransaction();
            Person person = new Person();
            person.FIRSTNAME = this.TextBox2.Text.ToString();
            person.LASTNAME = this.TextBox1.Text.ToString();
            Mapper.Instance().Update("UpdatePer",person);
            Mapper.Instance().CommitTransaction();
        }
3.Mapper.cs类:
public class Mapper
    {
        private static volatile SqlMapper _mapper = null;
        protected static void Configure(object obj)
        {
            _mapper = (SqlMapper)obj;
        }
        protected static void InitMapper()
        {
            ConfigureHandler handler = new ConfigureHandler(Configure);
            _mapper = SqlMapper.ConfigureAndWatch(handler);
        }
        public static SqlMapper Instance()
        {
            if (_mapper == null)
            {
                lock (typeof(SqlMapper))
                {
                    if (_mapper == null) // double-check
                        InitMapper();
                }
            }
            return _mapper;
        }        public static SqlMapper Get()
        {
            return Instance();
        }
    }