Why do I need Stored Procedures when I have LINQ to SQL

Question

My understanding of Linq to Sql is it will take my Linq statement and convert it into an equivalent SQL statement.

So

var products = from p in db.Product         


        

Answer 1

Simple example:

select * from Products where GetCategoryType(CategoryName)=1

GetCategoryType can run really fast, because it runs on the DB server. There's no Linq to SQL substitute for that as far as I know.