c# - Linq to SQL で Distinct を使用する

Question

このクエリはどのように sql から linq に変更されますか?

category
select distinct prodCategory from table4

subcategory
SELECT distinct [prodSubCat] FROM [table4] WHERE ([prodCategory] = @prodCategory)


prodCategory    prodSubCat
-------------------------------------
Home            Cassette Receiver
Home            Receiver
Home            cd player
Home            cd player
Home            Receiver
Car             dvd player
Car             GPS 

元。

私の目標は、prodCategory = "Car" の prodSubCat を取得することです。

Car             dvd player
Car             GPS