C#

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

namespace ReneApp.Domain
{
    public class Item
    {
        public string Status;                   // Status of the item.
        public string Title;                    // Title of the item.
        public string Series;                   // Series of the item.
        public string Author;                   // Author of the item.
        public string Type;                     // Type of item.
        public string Description;              // Description of the item.   
        public bool Addition;                   // Addition of item.

        public string status
        {
            get { return Status; }
            set { Status = value; }
        }

        public string title
        {
            get { return Title; }
            set { Title = value; }
        }

        public string series
        {
            get { return Series; }
            set { Series = value; }
        }

        public string author
        {
            get { return Author; }
            set { Author = value; }
        }

        public string type
        {
            get { return Type; }
            set { Type = value; }
        }

        public string description
        {
            get { return Description; }
            set { Description = value; }
        }

        public bool addition
        {
            get { return Addition; }
            set { Addition = value; }
        }
    }

    // Declare type to process item.
    public delegate void ProcessItemDelegate(Item item);
}

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

namespace ReneApp.Domain
{
    public class Transaction
    {
        // List of all items in the database:
        private IList<Item> list = new List<Item>();

        // Add an item to the database:
        public void AddItem(Item item)
        {
            list.Add(item);
        }

        public bool ValidateTransaction()
        {
            if (list == null)
                return false;
            return true;
        }

        // Process items
        public void ProcessItem(ProcessItemDelegate processItem)
        {
            foreach (Item b in list)
            {
                if (b.addition)
                    processItem(b);
            }
        }
    }
}

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

namespace ReneApp.Domain
{
    using NUnit.Framework;
    [TestFixture]

    public class TransactionTest
    {
        [Test]
        public void ValidateTransaction()
        {
            Transaction transaction1 = new Transaction("Stock", "Dark Rival", "Masters of Time", "Brenda Joyce", "Book", "Time Travel", true);
            Assert.IsTrue(transaction1.ValidateTransaction());
            Transaction transaction2 = new Transaction(" ", " ", " ", " ", " ", " ", " ");
            Assert.IsTrue(transaction2.ValidateTransaction());
        }


    }
}