using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Dictionary<string,string> customers =

        new Dictionary<string,string>()

        {

            { "John", "John@emailprovider.com"},

            { "Jane", "Jane@Greystoke.org"},

            { "Eve", "Gilly@Eve.priv.uk"}

        };

        var Orders=customers.Select(x=>new Order{CustomerName=x.Key,CustomerEmail=x.Value}).ToArray();

        Orders

        .ForEach(o=> o.EmailBuyer())

        .ForEach(o=> o.ProcessBilling())

        .ForEach(o=> o.ProcessShipping());

    }

}

​

public static class ExtensionForEach

{

    public static IEnumerable<T> ForEach<T>(this IEnumerable<T> enu, Action<T> action)

    {

    foreach (T item in enu) action(item);

    return enu; // make action Chainable/Fluent

    }

}

​

public class Order

{

    public string CustomerName

    {

        get;set;

    }

    public string CustomerEmail

    {

        get;set;

    }

    private bool _billed=false;

    public bool Billed

    {

        get

        {

            return _billed;

        }

        set

        {

            _billed=value;

        }

    }

    public void EmailBuyer()

    {

        Console.WriteLine("Emailing to " + this.CustomerName);

    }

    public void ProcessBilling()

    {

        Console.WriteLine("Billing to "  + this.CustomerName );

        Billed=true;

    }

    public void ProcessShipping()

    {

        if(!Billed) throw new InvalidOperationException("Order can not be shipped if bill is not processed.");

        Console.WriteLine("Shipping to " + this.CustomerName + " Bill Status:" + Billed.ToString());

    }

}