xml文件导入datatable,该如何解决

xml文件导入datatable
我有个xml文件想导入dataset中 使用 xml文件如下：
?xml version="1.0"?>
<disanze>  
  <disanze clausetype='U01' seats='05' counts='0' amunt='50000' premium='638'/>
  <disanze clausetype='U01' seats='06' counts='0' amunt='50000' premium='590'/>
  <disanze clausetype='U01' seats='10' counts='0' amunt='50000' premium='590'/> 
  <disanze clausetype='U01' seats='05' counts='0' amunt='100000' premium='920'/>
</disanze>
C# 代码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;

namespace dataset
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private DataSet getDataset()
        { 
            ///创建dataset
            DataSet ds = new DataSet();
            ///c创建datatable,添加列
            DataTable dsz = new DataTable("dsz");
            dsz.Columns.Add("clausetype", typeof(char));
            dsz.Columns.Add("seats",typeof(Int32));
            dsz.Columns.Add("counts", typeof(Int32));
            dsz.Columns.Add("amount", typeof(Int32));
            dsz.Columns.Add("premium", typeof(Decimal));
            try
            {
                ///导入xml
                XmlDocument doc = new XmlDocument();
                string myXMLFilePathDsz = "dsz.xml";
                XmlTextReader readerDsz = new XmlTextReader(myXMLFilePathDsz);
                doc.Load(readerDsz);
                if (doc == null)
                {
                    return null;
               }
                ///读取XML文件
                XmlNodeList nodeList = doc.SelectNodes("/dsz/disanze");//
                foreach (XmlNode node in nodeList)
                {   ///读取每一行的数据

                    DataRow row = dsz.NewRow();
                    row["clausetype"] = Convert.ToChar(node.Attributes["clausetype"].Value);//通过XmlNode.Attributes属性，获取一个 XmlAttributeCollection，它包含该节点的属性。
                    row["seats"] = Convert.ToInt32(node.Attributes["seats"].Value);
                    row["counts"] = Convert.ToInt32(node.Attributes["counts"].Value);
                    row["amount"] = Convert.ToInt32(node.Attributes["amount"].Value);
                    row["premium"] = Convert.ToDecimal(node.Attributes["premium"].Value);
                    dsz.Rows.Add(row);
                }
            }