How to use Constructors and Deconstructors

Car.cs

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

namespace ConDecon
{
    class Car
    {
        public string Colour { get; set; }
        public int numWheels { get; set; }

        public Car()
        {
            Console.WriteLine("We have just created our car");
            Colour = "black";
            numWheels = 4;
            Console.WriteLine("The default car colour is " + Colour);
        }

        public Car(string col) : this() {
            Colour = col;
        }

        public Car(int wheels)
            : this()
        {
            numWheels = wheels;
        }

        public Car(string col, int wheels)
            : this()
        {
            Colour = col;
            numWheels = wheels;
        }


        ~Car()
        {
            //  This will be called when the car object is discard
            Console.WriteLine("The car has crashed - it had " + numWheels + " wheels");
            Console.ReadLine();
        }
    }
}

Program.cs

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

namespace ConDecon
{
    class Program
    {
        static void Main(string[] args)
        {

            Car mycar = new Car(3);
            Console.WriteLine("My car is coloured " + mycar.Colour);
            Console.WriteLine("My car has " + mycar.numWheels + " wheels");

            Console.ReadLine();
        }
    }
}