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

You use the Contains in a Where clause.

Something along these lines (untested):

var results = Product.Where(product => ProductTypeParty
                                            .Where(ptp => ptp.PartyId == 34)
                                            .Select(ptp => ptp.Id)
                                            .Contains(product.Id)
                           );