what is copy constructor?

Copy constructor means one of constructor of class takes object  as a parameter of same class.

Example:

    class customer

    {

        public int Cid { get; set; }

        public string Cname { get; set; }

        public  customer()

        {                

        }

        public customer(int id,string name)

        {

            this.Cid = id;

            this.Cname = name;

        }

        public customer(customer cobj)

        {

            this.Cid = cobj.Cid;

            this.Cname = cobj.Cname;

        }       

        static void Main()

        {

            customer cobj1 = new customer();

            cobj1.Cid = 105;

            cobj1.Cname = "narayanarao";

            Console.WriteLine(cobj1.Cid);

            Console.WriteLine(cobj1.Cname);

            customer cobs = new customer(cobj1);

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

            Console.WriteLine(cobs.Cid);

            Console.WriteLine(cobs.Cname);

            Console.Read();       

        }       

    }

In this case copy constructor doesn’t execute again the code. Which copies the data form existing object.or your passing object.