Object copy approaches in .net: Auto Mapper, Emit Mapper, Implicit Operation, Property Copy

Question

If some one knows any more ways of doing this in .NET and also what is your opinions about that approaches? Which approach you choose and why?

Here is the tests of different ways of object copy in .NET.

Tests Related to this original thread: http://stackoverflow.com/questions/531505/how-to-copy-value-from-class-x-to-class-y-with-the-same-property-name-in-c

So, here it is, you can run it yourself:

static void Main(string[] args)
    {
        Student _student = new Student();
        _student.Id = 1;
        _student.Name = "Timmmmmmmmaaaahhhh";
        _student.Courses = new List<int>();
        _student.Courses.Add(101);
        _student.Courses.Add(121);

        Stopwatch sw = new Stopwatch();

        Mapper.CreateMap<Student, StudentDTO>();            

        StartTest(sw, "Auto Mapper");

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO dto = Mapper.Map<Student, StudentDTO>(_student);
        }

        StopTest(sw);

        StartTest(sw, "Implicit Operator");

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO itemT = _student;
        }

        StopTest(sw);

        StartTest(sw, "Property Copy");

        for (int i = 0; i < 1000000; i++)
        {

            StudentDTO itemT = new StudentDTO
            {
                Id = _student.Id,
                Name = _student.Name,
            };

            itemT.Courses = new List<int>();
            foreach (var course in _student.Courses)
            {
                itemT.Courses.Add(course);
            }
        }

        StopTest(sw);

        StartTest(sw, "Emit Mapper");

        ObjectsMapper<Student, StudentDTO> emitMapper = ObjectMapperManager.DefaultInstance.GetMapper<Student, StudentDTO>();

        for (int i = 0; i < 1000000; i++)
        {
            StudentDTO itemT = emitMapper.Map(_student);
        }

        StopTest(sw);
    }

Tests results on my PC:

Test Auto Mapper:22322 ms

Test Implicit Operator:310 ms

Test Property Copy:250 ms

Test Emit Mapper:281 ms

You can get emit and auto -mappers from here:

http://emitmapper.codeplex.com/

http://automapper.codeplex.com/