Difference between class and struct during the reference passing : struct « struct « C# / CSharp Tutorial

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


    class MyClass
    {
        public int val;
    }

    struct myStruct
    {
        public int val;
    }

    class Program
    {
        static void Main(string[] args)
        {
            MyClass objectA = new MyClass();
            MyClass objectB = objectA;
            objectA.val = 10;
            objectB.val = 20;
            myStruct structA = new myStruct();
            myStruct structB = structA;
            structA.val = 30;
            structB.val = 40;
            Console.WriteLine("objectA.val = {0}", objectA.val);
            Console.WriteLine("objectB.val = {0}", objectB.val);
            Console.WriteLine("structA.val = {0}", structA.val);
            Console.WriteLine("structB.val = {0}", structB.val);

        }
    }

6.1.struct
	6.1.1.	Structures
	6.1.2.	Declare a simple struct
	6.1.3.	A simple struct with method
	6.1.4.	class vs struct
	6.1.5.	Reference value type in a struct
	6.1.6.	struct with value types
	6.1.7.	struct with value types and ref types
	6.1.8.	Difference between class and struct during the reference passing