Custom Code for Moving Item from one directory to another

itemMoving.cs

using Sitecore.Configuration;
using Sitecore.Data.Items;
using Sitecore.Data;
using Sitecore.Data.Fields;

namespace sitecore.local.CustomCode
{
    public class ItemMoving
    {
        private readonly Database _sourceDatabase = Factory.GetDatabase("master");

        public void Execute()
        {
            var itemContainer = _sourceDatabase.GetItem("/sitecore/content/AutoArchive/News");
            var destinationContainer = _sourceDatabase.GetItem("/sitecore/content/AutoArchive/News Archive");
            if (itemContainer != null)
            {
                var items = itemContainer.Children;
                foreach (Item item in items)
                {
                    var expiryDate = (DateField)item.Fields["Expiration Date"];
                    if (expiryDate.DateTime < System.DateTime.Now.ToUniversalTime()) {
                        item.MoveTo(destinationContainer);
                    }
                }
            }
        }
    }
}