Count search results in Lucene.Net -

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i'm new lucene , want count occurences of search word in index. saw should use like:

 indexreader reader = .......

termdocs termdoc = reader.termdocs();

termdoc.seek(new term("my_field", mstrsearchfor));

int occurencecount = termdoc.freq();

i can't seem create indexreader start. 

fsdirectory directory = fsdirectory.open(new system.io.directoryinfo("c:\\temp\\")); indexreader reader = indexreader.open(directory, true);

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