using System;

​

// can inherit from class as well as interface

// class cannot inherit from struct (because it is a sealed type)

public class Customer

{

    public string name { get; set; }

    public int ID { get; set; }

​

    public Customer()

    {

        // class can have parameterless constructor

    }

}

​

// cannot inherit from class, can inherit from interface

// struct is a sealed type, cannot inherit from struct

public struct CustomerStruct

{

    public string name { get; set; }

    public int ID { get; set; }

​

    public CustomerStruct(int Id, string Name)

    {

        // struct cannot have parameterless constructor

        ID = Id;

        name = Name;

    }

}

​

​

public class Program

{

    public static void Main(string[] args)

    {

        // class

        Customer C1 = new Customer

        {

            ID = 101,

            name = "Luna"

        };

        // C2 is a copy of C1, pointing to the same object on the heap

        Customer C2 = C1;

        C2.name = "Mary";

        Console.WriteLine($"C1.name = {C1.name}, C2.name = {C2.name}"); // C1.name = Mary, C2.name = Mary

​

        // Struct

        CustomerStruct C3 = new CustomerStruct

        {

            ID = 101,

            name = "Luna"

        };

        // C3 and c4 are different objects on the stack

        CustomerStruct C4 = C3;

        C4.name = "Mary";

        Console.WriteLine($"C3.name = {C3.name}, C4.name = {C4.name}"); // C3.name = Luna, C4.name = Mary

    }

}