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This can't be done with the standard library. It's quite common for people who want to do this to define their own extension method

    public static void Foreach<T>(this IEnumerable<T> items, Action<T> action)
    {
        foreach (var item in items) action(item);
    }

which would allow the one-liner

    vehicles.Foreach(v => v.HasRegistration |= vinList.Contains(v.VIN));

There doesn't appear to be a consensus on whether this is an elegant and useful extension method or an abomination, so check your local style guide first.

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Although it's not strictly an answer to the question, I must also point out that `Contains` on a list is a linear time operation, and unless you can guarantee that the list will never hold more than about three VINs you should first convert it to a data structure with a fast lookup. E.g.

    var vinLookup = vinList.ToHashSet();
    vehicles.Foreach(v => v.HasRegistration |= vinLookup.Contains(v.VIN));

If you don't have `ToHashSet` (in the standard library it's newish) then the implementation is just `new HashSet<string>(vinList)`.