新手 关于类属性

C# code

using System;using System.Collections.Generic;using System.Linq;using System.Text;namespace csharpOOP003{      class Program      {            static void Main(string[] args)            {                  person ps1 = new person("michell",gender.女,20,160);                  ps1.showinfo();                                    //ps1.NAME = "nick";                  //ps1.SEX = gender.男;                  //ps1.AGE = 27;                  //ps1.HEIGHT = 172;                  Console.WriteLine("大家好,我叫{0},性别{1},今年{2}岁,身高{3}厘米!",                        ps1.NAME, ps1.SEX, ps1.AGE,ps1.HEIGHT);                  Console.WriteLine("按任意键退出程序...");                  Console.ReadKey();            }      }      public enum gender { 男,女};      class person      {            private string _name;            private gender _sex;            private int _age;            private int _height;            public string NAME { get; set; }            public gender SEX { get; set; }            public int AGE { get; set; }            public int HEIGHT { get; set; }            public person()            {                  this._name = "";                  this._sex = gender.男;                  this._age = 0;                  this._height = 0;            }            public person(string name, gender sex, int age, int height)            {                  this._name = name;                  this._sex = sex;                  this._age = age;                  this._height = height;            }            public void showinfo()            {                  Console.WriteLine("我叫{0},性别{1},今年{2}岁,身高{3}厘米!",                        this._name,this._sex,this._age,this._height);            }      }}

//ps1.NAME = "nick";
//ps1.SEX = gender.男;
//ps1.AGE = 27;
//ps1.HEIGHT = 172;
为什么在注释掉那几行时,结果为:
我叫michell,性别女,今年20岁,身高160厘米
大家好,我叫,性别男,今年0岁,身高0厘米!

不注释掉时,结果为:
我叫michell,性别女,今年20岁,身高160厘米!
大家好,我叫nick,性别男,今年27岁,身高172厘米!

我觉得应该都是一样的啊? 请高手详解!



[解决办法]
当然不是。
自动属性使用编译器自己生成的后备字段。