ASP.NET query to delete

I need a query that deletes everything from the "Names" table but only where where is not a matching ID in the "Departments" table.  So in the example below, ID's 1, 3 and 6 would  be deleted, but ID's 2, 4 and 5 would not be deleted.  I can't figure out the query.

   Names                                                    Departments

ID     Name                                           ID            Department
==     =====                                          ==            ==========
1       Smith                                          2               Accounting
2       Jones                                           4               Management
3       Miller                                          5               Purchasing
4       Washington
5       Lewis
6       Brown
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AnujSQL Server DBACommented:
FROM Names N
INNER JOIN Department M
Hi try this:

delete from names where Id not in (select e.Id from Names e, Departmentt d where e.Id=d.Id)

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