Alter XML root name

Question

I am trying to deserialize an XML file that looks like this:

<ArrayOf__ptd_student_charges
    xmlns="http://schemas.datacontract.org/2004/07/something.something"
    xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
    <__ptd_student_charges>
        ...
    </__ptd_student_charges>
</ArrayOf__ptd_student_charges>

The xmlns=.. part is giving me problems when deserializing, so before parsing it I would like to change the root to:

<ArrayOf__ptd_student_charges>
    <__ptd_student_charges>
        ...
    </__ptd_student_charges>
</ArrayOf__ptd_student_charges>

Is there any way to do this? I am loading my XML from a web api into an XDocument:

HttpWebRequest request = WebRequest.Create(stringUrl) as HttpWebRequest;
HttpWebResponse response = request.GetResponse() as HttpWebResponse;

XDocument xdoc = XDocument.Load(response.GetResponseStream());