How do you force explicit tag closing with Linq XML?

Question

This is the same question as: Explicit Element Closing Tags with System.Xml.Linq Namespace

but I use Net 4.0 and the answers do not work anymore.

The problem i

Answer 1

set the value of the XElement to String.Empty

OR

setting the IsEmpty property to false for all elements not having any child nodes

    foreach (XElement childElement in
        from x in document.DescendantNodes().OfType()
        where x.IsEmpty
        select x)
    {
        childElement.IsEmpty = false;
    }