csharp: DefaultValueAttribute Class

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public class CalendarEvent {         public int id { get; set; }       public string title { get; set; }           public string description { get; set; }       [DefaultValue(typeof(DateTime), DateTime.Now.ToString("yyyy-MM-dd HH:mm"))]     public DateTime start { get; set; }     [DefaultValue(typeof(DateTime),DateTime.Now.ToString("yyyy-MM-dd HH:mm"))]     public DateTime end { get; set; }     [DefaultValue(typeof(bool), "false")]     public bool allDay { get; set; }     [DefaultValue(typeof(bool), "false")]     public bool overlap { get; set; }     [DefaultValue(typeof(string), "background-color")]     public string rendering { get; set; } //border-color,background-color     [DefaultValue(typeof(string), "#FFFFFF")]     public string color { get; set; } //     [DefaultValue(typeof(string), "#FFFFFF")]     public string backgroundColor { get; set; }     [DefaultValue(typeof(string), "#FFFFFF")]     public string textColor { get; set; }     [DefaultValue(typeof(string),"#FFFFFF")]     public string borderColor { get; set; }     [DefaultValue(typeof(int),"0")]     public int typeid { get; set; }     [DefaultValue(typeof(DateTime), DateTime.Now.ToString("yyyy-MM-dd HH:mm"))]     public DateTime adddate { get; set; }           //private DateTime? dateCreated = null;       //public DateTime DateCreated     //{     //    get     //    {     //        return this.dateCreated.HasValue     //           ? this.dateCreated.Value     //           : DateTime.Now;     //    }       //    set { this.dateCreated = value; }     //}         public DateTime DateCreated     {         get         {             return (this.dateCreated == default(DateTime))                ? this.dateCreated = DateTime.Now                : this.dateCreated;         }           set { this.dateCreated = value; }     }     private DateTime dateCreated = default(DateTime);       private bool myVal = false;       [DefaultValue(false)]     public bool MyProperty     {         get         {             return myVal;         }         set         {             myVal = value;         }     }     }

　http://stackoverflow.com/questions/691035/setting-the-default-value-of-a-datetime-property-to-datetime-now-inside-the-syst