我用chart组件显示数据，Y线用机器爆出异常的次数，然后我想在这条bar上显示机器编号，异常名称，所占百分比，代码如下：

 ch_ErrorAnalysis.DataSource = dt;
        if (dt != null && dt.Rows.Count > 0)
        {
            foreach (DataRow dr in dt.Rows)
            {
                ch_ErrorAnalysis.Series["ErrorBarSeries"].YValueMembers = "ErrorCount";
                ch_ErrorAnalysis.Series["ErrorLineSeries"].YValueMembers = "CountNumb";
                ch_ErrorAnalysis.Series["ErrorBarSeries"].Label = "百分比：" + dr["CountNumb"].ToString() + "%\n" + "机器编号:" + dr["MAID"].ToString() + "\n" +
                "异常名称:" + dr["ErrorName"].ToString();

然后lable上显示的总是最后一条记录的数据，怎么依次显示