Constructors c#

Write a program to showing different types of constructors.

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace Csharp

{

    /// <summary>

    /// (a)Default Constructor

    /// (b)Parameterized Constructor

    /// (c)static Constructor

    /// (d)Copy Constructor

    /// (e)Private Constructor

    /// </summary>

    class Constructor

    {

        public static void Main(string[] args)

        {

            defaultconstructor obj1 = new defaultconstructor();

            obj1.member();

            int a, b;

            Console.WriteLine("Enter the values of a,b");

            a = Convert.ToInt32(Console.ReadLine());

            b = Convert.ToInt32(Console.ReadLine());

            constructor obj = new constructor(a, b);

            obj.display();

            privateconstructor obj2 = privateconstructor.createinstance();

            obj2.result();

            staticconstructor obj3 = new staticconstructor();

            obj3.display();

            copyconstructor ob1 = new copyconstructor(10, 20);

            ob1.display();

            // Here we are using copy constructor. Copy constructor is using the values already defined with ob1

            copyconstructor ob2 =new copyconstructor(ob1);

            ob2.display();

            Console.ReadLine();

          

        }

    }

    //(a) default constructor

    class defaultconstructor

    {

        int a, b;

        public defaultconstructor()

        {

            a = 5;

            b = 6;

        }

        public void member()

        {

            Console.WriteLine("Example of defaultconstructor");

            Console.WriteLine("The values of a is: {0} \n The value of b is: {1}", a, b);

            Console.WriteLine("===========================================================");

        }

    }

    //(b)parameterized constructor

    class constructor

    {

        int a, b;

        public constructor(int x, int y)

        {

            a = x;

            b = y;

        }

        public void display()

        {

            Console.WriteLine("Example of parameterizedconstructor");

            Console.WriteLine("Value of a: {0}",a);

            Console.WriteLine("Value of b: {0}",b);

            Console.WriteLine("===========================================================");

        }

    }

    //(c) private constructor

    class privateconstructor

    {

        public int a, b; public static int c, d;

        private privateconstructor(int x, int y)

        {

            this.a=x;

            this.b = y;

        }

        public static privateconstructor createinstance()

        {

            Console.WriteLine("Enter the values");

            c = Convert.ToInt32(Console.ReadLine());

            d = Convert.ToInt32(Console.ReadLine());

            return new privateconstructor(c,d);

        }

        public void result()

        {

            int z;

            z = a + b;

            Console.WriteLine("Example of privateconstructor");

            Console.WriteLine("The result is {0}", z);

            Console.WriteLine("===========================================================");

        }

    }

    //(d) static constructor

    class staticconstructor

    {

        static string carname, carmodel;

        static staticconstructor()

        {

            carname = "BMW";

            carmodel = "BMWZ8";

        }

        public void display()

        {

            Console.WriteLine("Example of static constructor");

            Console.WriteLine("The carname is {0}\n The carmodel is {1}", carname, carmodel);

            Console.WriteLine("===========================================================");

        }

    }

    //(e) copy constructor

    class copyconstructor

    {

        int a, b;

        public copyconstructor(int x, int y)

        {

            this.a = x;

            this.b = y;

        }

        public copyconstructor(copyconstructor a)

        {

            this.a = a.a;

            this.b = a.b;

        }

        public void display()

        {

            Console.WriteLine("Example of copy constructor");

            int z = a + b;

            Console.WriteLine(z);

            Console.WriteLine("===========================================================");

        }

    }

}