LINQ2SQL: how to delete entity by retrieving it from datagridview?

I have a datagridview and attached list of Employees to it, somthing like this:

IQueryable<Employee> data = (from em in db.Employees
                             where em.StationID == stationID
                             select em);
dgvView.DataSource = data;

Now I want to delete specific Employee by selected row in datagridview:

using (PetrolNetwork db = new PetrolNetwork())
                {
                    Employee empl = (Employee)dgvView.CurrentRow.DataBoundItem;
                    db.Employees.DeleteOnSubmit(empl);
                    db.SubmitChanges();
                }

Not surprise, that I've got exception "Cannot remove an entity that has not been attached."
When I replace this code by:

Employee employee = (from em in db.Employees
                                         where em.ID == empl.ID
                                         select em).Single();
                    db.Employees.DeleteOnSubmit(employee);
                    db.SubmitChanges(); 

all work correctly, but in sqlprofiler we can see one extra select to database to retrieve our specific employee, and then delete from statement.
How I can delete my employee, when I got it from DataBoundItem from datagridview without any extra select statements? One approach that I can see is custom sproc to delete by ID. May be there is any other best approaches?