using System;

using System.Collections.Generic;

using System.Collections.ObjectModel;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var customers = new CustomerCollection("Customer1;Customer2");

​

        foreach (var customer in customers)

        {

            Console.WriteLine(customer.Name);

        }

        foreach (var customer in customers.Items)

        {

            Console.WriteLine("Items: " + customer.Name);

        }

    }

​

    public class Customer

    {

        public Customer(string customer)

        {

            this.Name = customer;

        }

        public string Name { get; set; }        

    }

    public class CustomerCollection : Collection<Customer>

    {

        public CustomerCollection(string customerString)

        {

            var customers =

                    customerString

                        .Split(';')

                        .Select(s => s.Trim())

                        .Where(s => !string.IsNullOrEmpty(s))

                        .Select(s => new Customer(s));

​

            foreach (var customer in customers)

            {

                this.Add(customer);

            }

        }

        public new IEnumerable<Customer> Items

        {

            get

            {

                return this;

            }

        }

    }

}