stackoverflow-50853573

using System;
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization;
using System.IO;

namespace ConsoleApp
{
    [Serializable]
    class MyClass
    {
        private DateTime? myDate;
        public DateTime? MyDate
        {
            get{return myDate;}
            set
            {
                if (myDate != value)
                {
                    myDate = value;
                }
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            IFormatter formatter = new BinaryFormatter();
            var memoryStream = new MemoryStream();
            var myclasses = new MyClass[] {
                new MyClass{ MyDate = DateTime.Today },
                new MyClass{ MyDate = null }
            };
            formatter.Serialize(memoryStream,myclasses);

            memoryStream.Position = 0;
            var myclasses2 = (MyClass[])formatter.Deserialize(memoryStream);
            foreach (var myclass in myclasses2)
                Console.WriteLine(myclass.MyDate);
            Console.ReadLine();
        }
    }
}