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using a ListBox with SelectionMode="Multiple" in a linq query

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As of now I use the code below...
var queryPoints = from ad in this.db.ActivityDatas
where ad.SubActivityId ==
int.Parse(SubActivityId.SelectedItem.Value) //only one selected
select new

However only one selection form the listbox is used in the where
I have tried with the following and several others... however I cant
seem to find they right syntax

SubActivityId.Items.Cast<ListItem>().Contains(new ListItem() { Text =
ad.SubActivity.Name, Value = ad.SubActivityId.ToString() })
SubActivityId.Items.Cast<ListItem>().Contains(SubA ctivityId)

And numerous others...

it's the items with SubActivityId.Items[x].Selected == true I want to
compare SubActivityId.Items[x].Value with ad.SubActivityId on. Hope I
make sense...

best regards
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