值类型和引用类型的区别

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

namespace ConsoleApplication3
{
    class Program
    {
        static void Main(string[] args)
        {
            Ref ref1 = new Ref(1);
            Ref ref2 = ref1;
            ref2.I = 2;

            Val val1 = new Val(1);
            Val val2 = val1;
            val2.I = (2);

            Console.WriteLine("ref1----"+ref1);
            Console.WriteLine("ref2----"+ref2);
            Console.WriteLine("val1----"+val1);
            Console.WriteLine("val2----"+val2);
            Console.ReadLine();
        }
        /// <summary>
        /// 引用类型
        /// </summary>
        public class Ref
        {
            private int _int;

            public Ref(int i)
            {
                _int = i;
            }

            public int I
            {
                get { return _int; }
                set { _int = value; }
            }

            public override string ToString()
            {
                return "I的值为：" + _int.ToString();
            }
        }
        /// <summary>
        /// 值类型
        /// </summary>
        public struct Val
        {
            private int _int;

            public Val(int i)
            {
                _int = i;
            }

            public int I
            {
                get { return _int; }
                set { _int = value; }
            }

            public override string ToString()
            {
                return "I的值为：" + _int.ToString();
            }
        }
    }
}

 static void Main(string[] args)
        {        
            Ref ref1 = new Ref(1);
            Ref ref2 = new Ref(1);
            Val val1 = new Val(1);
            Val val2 = new Val(1);
            Console.WriteLine(ref1.Equals(ref2));
            Console.WriteLine(val1.Equals(val2));
            Console.ReadLine();
        }