In some Senario, may only need to init the object when using ,so lazyLoading will be a good choice.

Sample Class:

public class Product
    {
        public Product()
        {
            //do many things here ,will take long time
            Thread.Sleep(1000);
        }
        public int Id { get; set; }
        public string Name { get; set; }
        public string TypeCode { get; set; }
    }

Sample class test lazy loading:

public class LazyLoadingTest
    {
        public Product GetProduct(int id, string name, string typecode)
        {
            return new Product()
                {
                    Id = id,
                    Name = name,
                    TypeCode = typecode
                };
        }


        public Lazy<Product> GetLazyProduct(int id, string name, string typecode)
        {
            return new Lazy<Product>(() =>
                                     new Product() {Id = id, Name = name, TypeCode = typecode});
        }
    }

Test code:

 var llt = new LazyLoadingTest();
            var p1 = llt.GetProduct(1, "tablet", "x101");
//As Product is not lazy loading obj , so here constructure will be created.


            var p2 = llt.GetLazyProduct(2, "computer", "y202");


            var productName1 = p1.Name;
            var productName2 = p2.Value.Name;
// As P2 is a lazy product object , only when P2 object is using , there is a construction here .