public static class A
{
   private static Func<MyContextEntities, int, Orders> compiledGetById;
 
  static A()
  {
     compiledGetById = CompiledQuery.Compile<MyContextEntities, int, Orders>(((ctxt, orderId) => (from o in ctxt.Orders where o.Id == orderId select o).FirstOrDefault()));
  }
 
  public static Orders GetOrderById(int orderId)