public class Dog
{
private const string _birthStringFormat = "yyyy-MM-dd";
[XmlIgnore]
public DateTime Birth {get; set;}
[XmlElement(ElementName="Birth")]
public string BirthString
{
get { return Birth.ToString(_birthStringFormat); }
set { Birth = DateTime.ParseExact(value, _birthStringFormat, CultureInfo.InvariantCulture); }
}
}