How to use XCData in naming xelements in c#?

[Csharpcoder]

I want to use texbox text to name my elements i have tried using XCData but it returns with names cannot begin with '<'. Here is my code.

  XDocument xdoc = XDocument.Load("SavedData.xml");
            xdoc.Add(new XElement(new XCData(textbox1.text).ToString(),textbox2.text));