How To Add “:” (namespace prefix) in XAttribute Name in Xml

[green95j]

i have one xml file and using in silverlight.\[code\]doc.Descendants(xamlparent).FirstOrDefault().Add(new XAttribute("x:Class","WorkflowConsoleApplication1.modify"));\[/code\]but in this ":" hexadecimal cause error.how can i add this hexadecimal in attribute name.is this possible ?.