Inner join with LINQ in SharePoint 2010

var x = from cust in dataContext.Customers.ToList()
                    join ord in dataContext.Orders.ToList()
                    on cust.CustomerID.ToString().Trim() equals    
                    ord.CustomerID.CustomerID.ToString().Trim()
                    select new
                    {
                        CustomerID = cust.CustomerID,
                        Title = cust.Title,
                        City = cust.City,
                        CustomerCountry = cust.CustomerCountry,
                        JoiningDate = cust.JoiningDate,
                        OrderTitle = ord.Title
                    };
            dataGrdCustomer.DataSource = x.ToList();