how to remove Xelement without its children node using LINQ?

Question

Here is my XML,

Answer 1

Approved answer will always add children to the end of document. If you need to remove entry in the middle of the document and keep children where they sit, do following:

x.AddAfterSelf(x.Nodes());
x.Remove();

Following code removes all nodes keeping children in the correct place:

while (doc.Descendants("x").Count() > 0)
{
    var x = doc.Descendants("x").First();
    x.AddAfterSelf(x.Nodes());
    x.Remove();
}