how to replace the Sub tags of xml while Reading the Xml file

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XML

<ns1:savequote_genericelement xmlns:ns1="#unknown">
<ns1:usercode>{CUST250}
<ns1:rolecode>{SUPERUSER}
<ns1:pretcode>
<ns1:userid>
<ns1:roleid>
<ns1:userroleid>
<ns1:branchcode>
<ns1:preterr>
<ns1:polbranchcode>
<ns1:productname>{Private Car}
<ns1:policyholdercode>{PO00000188}
<ns1:eventdate>{07/10/2013}
<ns1:netpremium>
<ns1:properties>
<ns1:value>Y
<ns1:name>Fire explosion self ignition or lightning peril required

<ns1:properties>
<ns1:value>Y
<ns1:name>Burglary housebreaking or theft peril required

<ns1:properties>
<ns1:value>Y
<ns1:name>Riot and strike peril required

<ns1:properties>


In front end i am call the XMl File That will be look Like



string xmlContent = CreateXmlFile(1);
xmlContent = xmlContent.Replace("{userCode}", "CUST250");
xmlContent = xmlContent.Replace("{rolecode}", "SUPERUSER");
xmlContent = xmlContent.Replace("{PRetCode}", "0");

xmlContent = xmlContent.Replace("{productName}", "Private Car");
xmlContent = xmlContent.Replace("{policyHoldercode}", "PO00000188");
xmlContent = xmlContent.Replace("{eventDate}", "07/10/2013");

this is how i am replacig for Sub Tags how should Relace them Could ANy one Suggest Me with an Example

Thanks And Regards,
Rahul.