reading xml element using xdocument

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C#

Hi,
i m trying to consume a webservice in xml.linq in order to avoid the service timeoit on a slow network.
I called the linq as shown below but it will returning an error. The character : hexadecimal value 0x3A cannot be included in the name.

Try{
XDocument xdoc ;
xdoc.load("theurl");
textboxname.text =xElement("Ax27:Accountname").value;
}
catch (Exeception as ex){
textbox.text=ex.message;
}

===========================================
here is the document
============================================

xmlns:ns="http://rpaymentdata.com">
<ns:return xsi:type="ax27:customeraccts" xmlns:xsi="http://www.w3.org/2001/XMLschema-instance" xmlns:ax27="http:paymentdata.com/xsd">
<ax27: xsi:type="ax27:customeraccts" acctsumm="">
<ax27:acctno>100003457</ax27:acctno>
<ax27:accountname> Yusuf ahmed</ax27:accountname></ax27:></ns:return></ns:getaccoutsummary>