internal void AddSequenceQueryOption(QueryOptionExpression qoe)
{
Debug.Assert(qoe != null, "qoe != null");
QueryOptionExpression old = this.sequenceQueryOptions.Where(o => o.GetType() == qoe.GetType()).FirstOrDefault();
if (old != null)
{
qoe = qoe.ComposeMultipleSpecification(old);
this.sequenceQueryOptions.Remove(old);
}
this.sequenceQueryOptions.Add(qoe);
}