public string SaveOrder(Order order)
 {
     try
     {
         using (var db = new NORTHWINDEntities())
         {
             var newOrder = new DataModels.Order()
             {
                 OrderDate = DateTime.Now, EmployeeID = 3, CustomerID = "GREAL"
             };
             db.Orders.Add(newOrder);
             db.SaveChanges();
             var newOrderDetail = new Order_Detail()
             {
                 OrderID = newOrder.OrderID, ProductID = order.ProductID, UnitPrice = order.UnitPrice, Quantity = order.Quantity, Discount = 0
             };
             db.Order_Details.Add(newOrderDetail);
             db.SaveChanges();
             return("Inserted successfully");
         }
     }
     catch (Exception e)
     {
         throw new FaultException <ServiceExecptions>(new ServiceExecptions()
         {
             Reason = e.Message
         });
     }
 }
		private void detach_Orders(Order entity)
		{
			this.SendPropertyChanging();
			entity.Address = null;
		}
		private void attach_Orders(Order entity)
		{
			this.SendPropertyChanging();
			entity.Address = this;
		}