http://samueleresca.net/2015/03/conditional-serialization-using-csharp/

conditional_serialization\Telefilm.cs

 //Class Telefilm
    [Serializable]
    public class Telefilm
    {
        public int TelefilmId { get; set; }
        public string TelefilmName { get; set; }
        public DateTime CreateDate { get; set; }

        public bool ShouldSerializeCreateDate() {
            return (!TelefilmName.Equals("Californication")); //Bool EXP
        }
    }