C# this调用构造函数及析构函数

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace trainProject
{

    public class Student
    {
        public string Name { get; set; }

        public int Age { get; set; }

        public char Sex { get; set; }

        public string Id { get; set; }

        public Student(string id, string name, int age, char sex)
        {
            this.Id = id;
            this.Name = name;
            this.Age = age;
            this.Sex = sex;
        }
　　　　 
　　     
　　　　 //this ：调用本类的其他构造函数
        public Student(string id, string name)
            : this(id, name, , '')
        {

        }

        public Student(string id, string name, int age)
            : this(id, name, age, '')
        {

        }

        //析构函数  释放资源
        ~Student()
        {
            Console.WriteLine("析构函数");
        }

    }
}