How to Get WSS ID from Term using Server Side Object Model

public int FetchWssIdByTerm(SPWeb rootWeb, Term term)
{
    int wssID;
    if (rootWeb.Properties.ContainsKey("TaxonomyHiddenList"))
    {
        Guid taxonomyHiddenListId = new
        Guid(rootWeb.Properties["TaxonomyHiddenList"]);
        SPList taxonomyHiddenList = rootWeb.Lists[taxonomyHiddenListId];
        SPQuery query = new SPQuery();
        query.Query = string.Format(@
        "<Where><And>
            <Eq><FieldRef Name='IdForTerm' />
            <Value Type='Text'>{0}</Value>
            </Eq>
            <Eq><FieldRef Name='IdForTermSet' />
            <Value Type='Text'>{1}</Value>
            </Eq>
            </And>
            </Where>", term.Id, term.TermSet.Id);
        SPListItemCollection items = taxonomyHiddenList.GetItems(query);
        if (items.Count > 0) {
            wssID = int.Parse(items[0]["ID"].ToString());
        }
    }
    return wssID;
}