How Do I Convert This Linq To Sql

(from d in Context.OrderDetails
                        join p in Context.Products on d.ProductID equals p.ProductID
                        where d.OrderID==orderid
                        select new
                            {
                                d.DetailID,
                              p.ProductTitle,
                              d.ProductCount,
                              p.ProductPrice,
                                Psum = (from da in Context.OrderDetails where da.DetailID == d.DetailID select da.ProductCount * da.ProductPrice).FirstOrDefault()
                            }).ToList();