What is LINQ equivalent of SQL’s “IN” keyword

Question

How can I write below sql query in linq

select * from Product where ProductTypePartyID IN
(
    select Id from ProductTypeParty where PartyId = 34
)
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Answer 1

Something similar to this

var partyProducts = from p in dbo.Product 
                    join pt in dbo.ProductTypeParty on p.ProductTypePartyID equal pt.PartyId 
                    where pt.PartyId = 34 
                    select p