You have to put the correct serialization attributes on your class and class members
[Serializable()]
[XmlRoot(ElementName = "row")]
public class ProductAttribute
{
[XmlAttribute("flag")]
public string Flag { get; set; }
[XmlAttribute("sect")]
public string Sect { get; set; }
[XmlAttribute("header")]
public string Header { get; set; }
[XmlAttribute("body")]
public string Body { get; set; }
[XmlAttribute("extrainfo")]
public string Extrainfo { get; set; }
}