N - tier project with WCF OData service, Entity Framework, MVC3.0, Ninject DI, jSOn.net and Automapper

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Runtime.Serialization;

namespace eShopping.Entities.Entities
{
    [DataContract(IsReference = true)]
    [KnownType(typeof(Order))]
    [KnownType(typeof(Product))]
    public partial class Order_Detail
    {
        #region Primitive Properties
        [DataMember]
        public virtual int OrderID
        {
            get { return _orderID; }
            set
            {
                if (_orderID != value)
                {
                    if (Order != null && Order.OrderID != value)
                    {
                        Order = null;
                    }
                    _orderID = value;
                }
            }
        }
        public int _orderID;
        [DataMember]
        public virtual int ProductID
        {
            get { return _productID; }
            set
            {
                if (_productID != value)
                {
                    if (Product != null && Product.ProductID != value)
                    {
                        Product = null;
                    }
                    _productID = value;
                }
            }
        }
        public int _productID;
        [DataMember]
        public virtual decimal UnitPrice
        {
            get;
            set;
        }
        [DataMember]
        public virtual short Quantity
        {
            get;
            set;
        }
        [DataMember]
        public virtual float Discount
        {
            get;
            set;
        }

        #endregion
        #region Navigation Properties
        
    
        [DataMember]
        public virtual Order Order
        {
            get { return _order; }
            set
            {
                if (!ReferenceEquals(_order, value))
                {
                    var previousValue = _order;
                    _order = value;
                    FixupOrder(previousValue);
                }
            }
        }
        public Order _order;
        
    
        [DataMember]
        public virtual Product Product
        {
            get { return _product; }
            set
            {
                if (!ReferenceEquals(_product, value))
                {
                    var previousValue = _product;
                    _product = value;
                    FixupProduct(previousValue);
                }
            }
        }
        public Product _product;

        #endregion
        #region Association Fixup
    
        public void FixupOrder(Order previousValue)
        {
            if (previousValue != null && previousValue.Order_Details.Contains(this))
            {
                previousValue.Order_Details.Remove(this);
            }
    
            if (Order != null)
            {
                if (!Order.Order_Details.Contains(this))
                {
                    Order.Order_Details.Add(this);
                }
                if (OrderID != Order.OrderID)
                {
                    OrderID = Order.OrderID;
                }
            }
        }
    
        public void FixupProduct(Product previousValue)
        {
            if (previousValue != null && previousValue.Order_Details.Contains(this))
            {
                previousValue.Order_Details.Remove(this);
            }
    
            if (Product != null)
            {
                if (!Product.Order_Details.Contains(this))
                {
                    Product.Order_Details.Add(this);
                }
                if (ProductID != Product.ProductID)
                {
                    ProductID = Product.ProductID;
                }
            }
        }

        #endregion
    }
}