System.Speech recognition error

System.Speech recognition error

I am writing a speech recognition program using system.speech from MS. I
have been going through the online tutorials and all the great info on
StackOverflow however i seem to keep running into an issue where the
recognizer seems to throw an error.
Below is the code I am using (minus the grammar creation).
Grammar grammarQuestionsSingle;
Grammar grammarQuestionsShort;
Grammar grammarQuestionsLong;
Grammar grammarStatement;
//Grammar grammarDeclarationShort;
//Grammar grammarDeclarationLong;
Grammar grammarCommandsSingle;
Grammar grammarCommandsShort;
Grammar grammarCommandsLong;
SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();
CreateGrammar grammar = new CreateGrammar();
Think brain = new Think();
bool privacy, completed;
//bool timer;
public void OpenEars()
{
completed = true;
if (grammarQuestionsSingle == null || grammarQuestionsShort ==
null || grammarQuestionsLong == null || grammarStatement == null
|| grammarCommandsSingle == null || grammarCommandsShort == null
|| grammarCommandsLong == null)
{
grammarQuestionsSingle = grammar.createGrammarQuestionsSingle();
grammarQuestionsShort = grammar.createGrammarQuestionsShort();
grammarQuestionsLong = grammar.createGrammarQuestionsLong();
grammarStatement = grammar.createGrammarStatement();
grammarCommandsSingle = grammar.createGrammarCommandsSingle();
grammarCommandsShort = grammar.createGrammarCommandsShort();
grammarCommandsLong = grammar.createGrammarCommandsLong();
}
recognizer.RequestRecognizerUpdate();
if (!grammarQuestionsSingle.Loaded)
{
recognizer.LoadGrammar(grammarQuestionsSingle);
}
if (!grammarQuestionsShort.Loaded)
{
recognizer.LoadGrammar(grammarQuestionsShort);
}
if (!grammarQuestionsLong.Loaded)
{
recognizer.LoadGrammar(grammarQuestionsLong);
}
if (!grammarStatement.Loaded)
{
recognizer.LoadGrammar(grammarStatement);
}
if (!grammarCommandsSingle.Loaded)
{
recognizer.LoadGrammar(grammarCommandsSingle);
}
if (!grammarCommandsShort.Loaded)
{
recognizer.LoadGrammar(grammarCommandsShort);
}
if (!grammarCommandsLong.Loaded)
{
recognizer.LoadGrammar(grammarCommandsLong);
}
DictationGrammar dictationGrammar = new
DictationGrammar("grammar:dictation");
dictationGrammar.Name = "DictationQuestion";
recognizer.LoadGrammar(dictationGrammar);
recognizer.RequestRecognizerUpdate();
recognizer.SetInputToDefaultAudioDevice();
Listening();
}
public void Listening()
{
while (!completed)
{
Thread.Sleep(333);
}
recognizer.SpeechRecognized += recognizer_SpeechRecognized;
recognizer.RecognizeAsync(RecognizeMode.Single);
}
private void recognizer_SpeechRecognized(object sender,
SpeechRecognizedEventArgs e)
{
completed = false;
SemanticValue sem = e.Result.Semantics;
if (!privacy)
{
if (e.Result.Grammar.Name=="CommandsSingle" &&
sem["keyCommandsSingle"].Value.ToString() == "go to sleep")
{
privacy = true;
brain.useMouth("ear muffs are on");
completed = true;
Listening();
}
else
{
brain.Understanding(sender, e);
completed = true;
}
}
else
{
if (e.Result.Grammar.Name == "CommandsSingle" &&
sem["keyCommandsSingle"].Value.ToString() == "wake up")
{
privacy = false;
brain.useMouth("I am listening again");
completed = true;
Listening();
}
}
completed = true;
Listening();
}
}
It recognizes the first phrase correctly but as soon as it completes the
actions in the speechrecognized handler, it throws the exception
"Cannot perform this operation while the recognizer is doing recognition.".
I have tried with the recognition being all in a single method however it
has the same results. This was my most recent attempt prior to posting
this question. What am I doing wrong?
As to clarify...
The program launches into the systray and calls this class.OpenEars().
OpenEars then calls class.Listening() which has the RecognizeAsync. After
speaking the first phrase and the recognizer hearing it correctly and
following the handler, the second phrase when spoken ends up triggering
the exception.