DateTime? y = 1 == 1 ? null: DateTime.MaxValue;
DateTime? y = null; // assignment works as expected

DateTime? x = default(DateTime?); //prints null on console

DateTime? x = null;               // prints null on console

DateTime? x = DateTime.MinValue;  //print 01/01/0001

DateTime? y = 1 == 1 ?(DateTime?) null : DateTime.MaxValue;

DateTime? y = 1 == 1 ? null : (DateTime?)DateTime.MaxValue;

DateTime? y = 1 == 1 ? (DateTime?)null : DateTime.MaxValue;

DateTime? x = null;

//Which is the preferred way for null assignments of DateTime? in c#.

DateTime? x = default(DateTime?); //prints null on console

DateTime? x = null; // prints null on console

DateTime? x = DateTime.MinValue; //print 01/01/0001

int y = 1;
  DateTime? dt3 = y == 1 ? (DateTime?)null : DateTime.MinValue;

DateTime? dt3 = null;

        if (y == 1)
             dt3 = null;
        else
            dt3 = DateTime.MinValue;

DateTime? dt = (DateTime?)null;