Handling + as a special character in Lucene search

How do i make sure lucene gives me back relevant search results when my
input string contains terms like c++? Lucene seems to ignore ++
characters.

Code details: When I execute this line,I get a blank search query.

queryField =
multiFieldQueryParser.Parse(inpKeywords);keywordsQuery.Add(queryField,
BooleanClause.Occur.SHOULD);And here is my custom analyzer:

public class CustomAnalyzer : Analyzer { private static readonly
WhitespaceAnalyzer whitespaceAnalyzer = new WhitespaceAnalyzer();
public override TokenStream TokenStream(String fieldName,
System.IO.TextReader reader) { TokenStream result =
whitespaceAnalyzer.TokenStream(fieldName, reader); result = new
StandardTokenizer(reader); result = new
LowerCaseFilter(result); result = new StopFilter(result,
stop_words); return result; }}And I'm executing search
query this way:

indexSearcher.Search(searchQuery, collector);

QueryParser has Escape(string s) method but MultiFieldQueryParser does not
seem to have one.Am using Lucene.net version 2.1.0.3