Selcect/ update attribute value using xpath navigator/ linq to xml

Question

Hi Folks,
below is my xml string and the highlighted bold attribute value needs to update. Since this element contains prefix im not able to select teh particular element. if i remove the prefixx im able to select but i need to keep prefix.
    <IOP:MtvnSvcReq xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:IOP="mtvnCWExternInteropReq" xmlns:IOP1="mtvnExtInteropReqData" xmlns:PR1="mtvnPRInteropReqData">
                          <IOP:Svc>
                                             <IOP1:PR1>
                                                   <PR1:PRExternSSOReqData>
<PR1:UserId>abcd</PR1:UserId>
                                                   </PR1:PRExternSSOReqData>
                                             </IOP1:PR1>
                            </IOP:Svc>
                    </IOP:MtvnSvcReq>
Thanks 

Answer 1

Hi Pulikk,
Do you mean you want  to change the attribute value(abcd)? If so,
Please try the following code, i tested on my side, it changed successfully.
//Here is the variable with which you assign a new value
string newValue = string.Empty;
XDocument objDoc = XDocument.Load(@"yourdata.xml");
XNamespace IOP = "mtvnCWExternInteropReq";
XNamespace IOP1 = "mtvnExtInteropReqData";
XNamespace PR1 = "mtvnPRInteropReqData";
foreach (var node in objDoc.Descendants(PR1 + "UserId"))
node.Value = newValue;
objDoc.Save(@"yourdata.xml");
Have a nice day!
Kristin
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