.NET Framework Formatting: Custom DateTime format

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Example

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); }
    }
}
Serialize object