c#操作xml增删改查

public void DeleteXml(string FromUserName="dddddd")
{
LoadXml();
XmlNodeList xnl = xmlDoc.DocumentElement.ChildNodes;
foreach (XmlElement elementxml in xnl)
{
if (elementxml.Name == "Person")
{
if (elementxml.Attributes["name"].Value == FromUserName)
{
XmlNode xmldocSelect = xmlDoc.SelectSingleNode("Root");
xmldocSelect.RemoveChild(elementxml);
}
}
}
xmlDoc.Save(Server.MapPath("../wx.xml"));
}