When using NumericField, get absolutely nothing back every time - lucene.net

Question

Been playing with Lucene.NET the last two days.
After reading up on Dates, I was led to believe that Dates are best converted to Milliseconds, and stored in NumericField, with Indexing=true, and Store=No.
But now nothing ever returns - it must be something basic, but I'm just not seeing it.
The saving code is as follows:
...
else if (type == typeof (DateTime?))
{
var typedValue = (DateTime?) value;
field = numericField = new NumericField(documentFieldName, 4, Field.Store.YES, true);
long milliseconds = typedValue.HasValue?(typedValue.Value.Date.Ticks/TimeSpan.TicksPerMillisecond):0;
numericField.SetLongValue(milliseconds);
doc.Add(numericField);
}
...
else
{
field = stringField = new Field(
documentFieldName,
(value != null)?value.ToString():string.Empty,
Store.YES,
Field.Index.ANALYZED) ;
doc.Add(stringField);
}
// Write the Document to the catalog
indexWriter.AddDocument(doc);
When I query for docs against the values saved in Field ... no problem.
When I query for documents by matching against the values in NumericFields, nothing returns.
Where did I go wrong?
Thanks for your help.
Lucene.Net.Analysis.Analyzer analyzer = new Lucene.Net.Analysis.Standard.StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_30);
var q2 = NumericRangeQuery.NewLongRange("Val", 3, 3, true, true);
var uxy2 = documentSearchManagementService.Search("Students", termQuery, "Id");
Using:
public ScoredDocumentResult[] Search(string indexName, Query query, params string[] hitFieldNamesToReturn)
{
if (_configuration.IndexRootDirectory.IsNullOrEmpty())
{
throw new Exception("Configuration.IndexRootDirectory has not been configued yet.");
}
indexName.ValidateIsNotNullOrEmpty("indexName");
hitFieldNamesToReturn.ValidateIsNotDefault("hitFieldNamesToReturn");
//Specify the index file location where the indexes are to be stored
string indexFileLocation = Path.Combine(_configuration.IndexRootDirectory, indexName);
Lucene.Net.Store.Directory luceneDirectory = Lucene.Net.Store.FSDirectory.Open(indexFileLocation);
IndexSearcher indexSearcher = new IndexSearcher(luceneDirectory);
TopScoreDocCollector topScoreDocCollector = TopScoreDocCollector.Create(10, true);
indexSearcher.Search(query, topScoreDocCollector);
List<ScoredDocumentResult> results = new List<ScoredDocumentResult>();
foreach (var scoreDoc in topScoreDocCollector.TopDocs(0, 10).ScoreDocs)
{
ScoredDocumentResult resultItem = new ScoredDocumentResult();
Lucene.Net.Documents.Document doc = indexSearcher.Doc(scoreDoc.Doc);
resultItem.Score = scoreDoc.Score;
List<ScoredDocumentFieldResult> fields = new List<ScoredDocumentFieldResult>();
foreach (string fieldName in hitFieldNamesToReturn)
{
string fieldValue = doc.Get(fieldName);
fields.Add(new ScoredDocumentFieldResult{Key= fieldName,Value=fieldValue});
}
resultItem.FieldValues = fields.ToArray();
results.Add(resultItem);
}
indexSearcher.Close();
return results.ToArray();
}