problems with while loop in indexing - no results given when I use that

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I use lucene.net to index the documents. My main aim was to get to search and 
have the line number and the line of text returned in a document.


Here's the code that indexes

using (TextReader contentsReader = new StreamReader(fi.FullName))
{
    doc.Add(new StringField("FullFileName", fi.FullName, Field.Store.YES));
    doc.Add(new StringField("LastModifiedDate", modDate, Field.Store.YES));
    //doc.Add(new TextField("Contents", contentsReader.ReadToEnd(), 
Field.Store.YES));

    int lineCount = 1;
    string line = String.Empty;
    while ((line = contentsReader.ReadLine()) != null)
    {
        doc.Add(new Int32Field("LineNo", lineCount, Field.Store.YES));
        doc.Add(new TextField("Contents", line, Field.Store.YES));
        lineCount++;
    }

    Console.ForegroundColor = ConsoleColor.Blue;
    Console.WriteLine("adding " + fi.Name);
    Console.ResetColor();
    writer.AddDocument(doc);
}


As you can see I add the filename, modified date, then I loop through all the 
lines in the file and add aTextFieldfor each line.


This is how I search:

Lucene.Net.Store.Directory directory = Lucene.Net.Store.FSDirectory.Open(new 
System.IO.DirectoryInfo(indexDir));
Lucene.Net.Search.IndexSearcher searcher = new 
Lucene.Net.Search.IndexSearcher(Lucene.Net.Index.DirectoryReader.Open(directory));
TopScoreDocCollector collector = TopScoreDocCollector.Create(100, true);
searcher.Search(query, collector);
ScoreDoc[] hits1 = collector.GetTopDocs().ScoreDocs;
for (int i = 0; i < hits1.Length; i++)
{
    int docId = hits1[i].Doc;
    float score = hits1[i].Score;

    Lucene.Net.Documents.Document doc = searcher.Doc(docId);

    string result = "FileName: " + doc.Get("FullFileName") + "\n"+
    " Line No: " + doc.Get("LineNo") + "\n"+
    " Contents: " + doc.Get("Contents");
}


Yet. My search results return 0 hits whereas if I simply comment out 
thatwhileloop and uncomment the commented line above I get the results.


What could be the problem?