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richtextbox1.Text=sr.ReadToEnd();
StreamReader sr=new StreamReader(...);
richtextbox1.Text=sr.ReadToEnd();
XDocument xdoc = XDocument.Load(Server.MapPath("A.xml"));
XElement xe = new XElement("name", "");
xdoc.Element("user").Element("name").Add(xe);
var query = from P in xdoc.Descendants("name")
select P.Value
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