.using System;

public class MyObj

{

    public string Field {get;set;}

    public DateTime? MyDate {get;set;}

}

​

public class Program

{

    public static void Main()

    {

        MyObj myObj = new MyObj()

        {

            Field = "foo",

            MyDate = 1 != 2 ? (DateTime?)DateTime.Now : null;

        };

        Console.WriteLine("Hello World");

    }

}