C#的初始化器

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;
using System.Linq;

namespace codeTest
{
    class Program
    {
        static void Main(string[] args)
        {
            MyClass myClass1 = new MyClass() { FristName = "myClass1", LastName = "LmyClass1" };
            MyClass myClass2 = new MyClass("myClass2", "LmyClass2");
            MyClass myClass3 = new MyClass("myClass2", "LmyClass2") { FristName = "myClass3", LastName = "LmyClass3",id= };
            myClass1.Show();
            myClass2.Show();
            myClass3.Show();
            List<MyClass> list = new List<MyClass>()
            {
               new MyClass() { FristName = "myClass1", LastName = "LmyClass1" },
               new MyClass("myClass2", "LmyClass2"),
               new MyClass("myClass2", "LmyClass2") { FristName = "myClass3", LastName = "LmyClass3",id= }
            };
            Dictionary<int, MyClass> dic = new Dictionary<int, MyClass>()
            {
                {,new MyClass() { FristName = "myClass1", LastName = "LmyClass1" }} ,
                {,new MyClass("myClass2", "LmyClass2")} ,
                {,new MyClass("myClass2", "LmyClass2") { FristName = "myClass3", LastName = "LmyClass3",id= }}
            };
            Console.ReadLine();
        }

    }

    public class MyClass
    {
        public string FristName;
        public string LastName { get; set; }
        public int id { get; set; }

        public MyClass()
        { }

        public MyClass(string frist,string last)
        {
            FristName = frist;
            LastName = last;
        } 

        public void Show()
        {
            Console.WriteLine("FristName:{0} LastName:{1} id:{2}", FristName, LastName, id);
        }
    }

}