Entity framework 3.5sp1 delete all in associated table?

What is the equivalent to:

DELETE * from ProductsCategories WHERE Product开发者_运维百科ID = 78

using entity framework 3.5sp1? Need to delete all categories that belongs to a product.

/M

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I have used code similar to this to delete records.

var productCategories = from pc in context.ProductCatgories
     where pc.ProductID == 78;
foreach(var category in productCategories)
{
    context.DeleteObject(category);
}

context.SaveChanges();