C# code does not output the XML format i want.

[WebMethod(Description = "GetAddressTest")]
[return: XmlRoot(ElementName = "AddressTest")]
public string GetAddressTest(string memberNbr)
{
    XNamespace defaultNamespace = XNamespace.Get("http://tempuri.org/Member.xsd");
    XElement addressInfo = new XElement("AddressDetail");
    IList<string> addressList = new List<string> { "101 state st", "201 exit st", "301 entrance st" };
    var i = 0;
    foreach (string item in addressList)
    {
        i++;
        addressInfo.SetElementValue("Address", item[i]);
    }
    return addressInfo.ToString();
}

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<?xml version="1.0" encoding="UTF-8"?>
<MemberSpansTest xmlns="http://www.w3.org/2001/XMLSchema-instance">
</MemberSpansTest>
	<MemberSpansDetail> 
		<Address>101 state st</Address> 
	</MemberSpansDetail>
	<MemberSpansDetail> 
		<Address>201 exit st</Address> 
	</MemberSpansDetail>
	<MemberSpansDetail> 
		<Address>301 entrance st</Address> 
	</MemberSpansDetail>
</MemberSpansTest>

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