How to search for specific ID's and NONE?

@operator

I'm using the SuiteTalk in C# and I'm doing a SearchMultiSelectCustomField type search.

I need to say none of ID's 1, 2, 3. That I get how to do.

How can I also exclude any that are blank? Is that done by ID or by name? I'm not having luck.

//filter on product line field
SearchMultiSelectCustomField productLineSelect = new SearchMultiSelectCustomField();
productLineSelect.internalId = "custentity_vcs_cust_product_line";
productLineSelect.@operator = SearchMultiSelectFieldOperator.noneOf;
productLineSelect.operatorSpecified = true;
ListOrRecordRef[] productLineRefs = new ListOrRecordRef[20];
productLineRefs[0] = new ListOrRecordRef();
productLineRefs[0].internalId = "10";
productLineRefs[1] = new ListOrRecordRef();
productLineRefs[1].internalId = "11";
productLineRefs[2] = new ListOrRecordRef();
productLineRefs[2].internalId = "14";
productLineRefs[3] = new ListOrRecordRef();
productLineRefs[3].internalId = "15";
productLineRefs[4] = new ListOrRecordRef();
productLineRefs[4].internalId = "16";
productLineRefs[5] = new ListOrRecordRef();