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XmlDocument doc = new XmlDocument();
doc.LoadXml("<WebSites><WebSite><URL>http://xml.luohuedu.net/</URL><Title>【孟宪会之精彩世界】之XML开发者园地</Title><Desc>讨论XML技术和Web技术地专业站点。</Desc></WebSite><WebSite><URL>http://lucky_elove.www1.dotnetplayground.com/</URL><Title>【孟宪会之精彩世界】之.NET开发者园地</Title><Desc>讨论.NET技术和应用的专业站点。</Desc></WebSite></WebSites>");
//比如查找到一个WebSite节点的OuterXml
XmlNode xxx = doc.SelectSingleNode("//WebSite");
XmlDocument doc2 = new XmlDocument();
doc2.LoadXml("<M>" + xxx.OuterXml + "</M>");
StringWriter sw = new StringWriter();
XmlTextWriter xtw = new XmlTextWriter(sw);
xtw.Formatting = Formatting.Indented;
xtw.Indentation = 2;
doc2.WriteTo(xtw);
string xml = sw.ToString().Trim();
textBox1.Text = xml.Substring(3, xml.Length - 7);
XmlDocument doc = new XmlDocument();
doc.LoadXml("<WebSites><WebSite><URL>http://xml.luohuedu.net/</URL><Title>【孟宪会之精彩世界】之XML开发者园地</Title><Desc>讨论XML技术和Web技术地专业站点。</Desc></WebSite><WebSite><URL>http://lucky_elove.www1.dotnetplayground.com/</URL><Title>【孟宪会之精彩世界】之.NET开发者园地</Title><Desc>讨论.NET技术和应用的专业站点。</Desc></WebSite></WebSites>");
StringWriter sw = new StringWriter();
XmlTextWriter xtw = new XmlTextWriter(sw);
xtw.Formatting = Formatting.Indented;
doc.WriteTo(xtw);
textBox1.Text = sw.ToString();