score:2

Accepted answer
from p in Products
where new int [] { 2,6,9 }.Contains(p.ProductID)
select p;

score:1

var q = from p in Products
        where p.productID==2 || p.productID==6 || p.productID==9
        select p;

foreach(var product in q)
{
  //...
}

or simply:

db.Products.Where(p=> p.productID==2 || p.productID==6 || p.productID==9)

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