xml to datatable

xml:

<DocumentElement>
<cityconfig>
<city>阿坝州</city>
<jc>abazhou</jc>
<nbf>s</nbf>
<viewname>view_news_title_index_abazhou</viewname>
</cityconfig>
<cityconfig>
<city>阿克苏</city>
<jc>akesu</jc>
<nbf>s</nbf>
<viewname>view_news_title_index_akesu</viewname>
</cityconfig>
<cityconfig>
<city>安达</city>
<jc>anda</jc>
<nbf>n</nbf>
<viewname>view_news_title_index_anda</viewname>
</cityconfig>
</DocumentElement>

string path = "./XMLFile1.xml"; ;
string content = GetContent(path);
StringReader txtReader = new StringReader(content);
XmlTextReader xmlReader = new XmlTextReader(txtReader);
DataSet ds = new DataSet();
ds.ReadXml(xmlReader);
string m = "";
foreach (DataColumn c  in ds.Tables[0].Columns)
{
m += c.ColumnName + "-";

}
return;// ds.Tables[0];

调用方法：

        public static String GetContent(String vFileName){StreamReader reader = new StreamReader(vFileName);StringBuilder result = new StringBuilder();string line = reader.ReadLine();while (line != null){result.AppendLine(line);line = reader.ReadLine();}reader.Close();return result.ToString();}