linq to xml example:

using System.Linq;
using System.Xml.Linq;
        [Test]
        public void TestMethod1()
        {
            string xml_str = "<BillingTypes> <BillingType ID=\"1\" Description=\"Statement\" /> <BillingType ID=\"2\" Description=\"Coupon\" /> <BillingType ID=\"3\" Description=\"EFT\" /> <BillingType ID=\"4\" Description=\"Visa\" /> </BillingTypes>";
            XDocument xml = XDocument.Parse(xml_str);
            var allowed = from billingtype in xml.Elements("BillingTypes").Elements("BillingType")
                          where billingtype.Attribute("ID").Value == "3"
                          select billingtype;

            foreach (var element in allowed){
                Debug.Print(element.Attribute("Description").Value);
            }

        } 

more...