?// Prototype pattern -- Structural example  

using System;

namespace DoFactory.GangOfFour.Prototype.Structural
{

    // MainApp test application 

    class MainApp
    {

        static void Main()
        {
            // Create two instances and clone each 

            ConcretePrototype1 p1 = new ConcretePrototype1("I");
            ConcretePrototype1 c1 = (ConcretePrototype1)p1.Clone();
            Console.WriteLine("Cloned: {0}", c1.Id);

            ConcretePrototype2 p2 = new ConcretePrototype2("II");
            ConcretePrototype2 c2 = (ConcretePrototype2)p2.Clone();
            Console.WriteLine("Cloned: {0}", c2.Id);

            // Wait for user 
            Console.Read();
        }
    }

    // "Prototype" 

    abstract class Prototype
    {
        private string id;

        // Constructor 
        public Prototype(string id)
        {
            this.id = id;
        }

        // Property 
        public string Id
        {
            get { return id; }
        }

        public abstract Prototype Clone();
    }

    // "ConcretePrototype1" 

    class ConcretePrototype1 : Prototype
    {
        // Constructor 
        public ConcretePrototype1(string id)
            : base(id)
        {
        }

        public override Prototype Clone()
        {
            // Shallow copy 
            return (Prototype)this.MemberwiseClone();
        }
    }

    // "ConcretePrototype2" 

    class ConcretePrototype2 : Prototype
    {
        // Constructor 
        public ConcretePrototype2(string id)
            : base(id)
        {
        }

        public override Prototype Clone()
        {
            // Shallow copy 
            return (Prototype)this.MemberwiseClone();
        }
    }
}