how to remove Xelement without its children node using LINQ?

Question

Here is my XML,

Answer 1

If node name is deprecated and must not be used in the whole document, just use ReplaceWith:

var xNode = doc.Descendants("x");
for (int i = 0; i < xNode.Count; i++)
{
    xNode[i].ReplaceWith(xNode[i].Nodes());
}