Question

I loaded an html document in the Xdocument object :

XDocument xdoc = Xdocument.load(path);
XElement el = new XElement("name","value");

xdoc.Descendants("body").Single().Add(el);  <=== sequence conatin no element

document contains the body element, then why this exception is coming ?

Answer 1

I suspect the problem is that it can’t find the body element due to namespacing. If it’s in a namespace, you can find it using:

XNamespace ns = "whatever the namespace uri is";
xdoc.Descendants(ns + "body").Single().Add(el);