LINQ to SQL WHERE "IN"

Question

iaがINでクエリを書き込む方法。私は、クエリに

Products.Where(x=>x.CategoryId = {4,5,6....}) 

Answer 1

Products.Where(x => arrayOfIDs.Contains(x.CategoryId)); 

Answer 2

LINQ to SQL query using "NOT IN"

を書きたいです