Recognition misfiring

Given the following code (C# 3.0) any noise even a "cough" will be 
recognized as the "Show Search" command what am I doing wrong?

        private void BuildNavigationGrammar()
        {
            Choices NavChoices = new Choices("Search");

            GrammarBuilder choicesBuilder = new
GrammarBuilder("Show");
            choicesBuilder.Append(new SemanticResultKey("choixNav", 
NavChoices));

            Grammar NavGrammar = new Grammar(choicesBuilder);

            cvRecognition.LoadGrammar(NavGrammar);

            NavGrammar.SpeechRecognized += delegate(object sender, 
SpeechRecognizedEventArgs e)
            {
                SemanticValue SeVa = e.Result.Semantics;
                if (SeVa.ContainsKey("choixNav"))
                {
                    Application app = System.Windows.Application.Current;
                    if (app != null)
                    {
                       
app.Dispatcher.BeginInvoke(DispatcherPriority.Background, 
new SimpleDelegate(cvAIM.ShowSearch));
                    }
                }
            };
        }

Which recognition engine do you use? Is this on Vista or XP? I was very 
curious, and tried this out myself. It works perfectly on my Vista box. I 
gets no recognition unless I say "Show Search".  Perhaps, there is
something 
wrong with your Speech profile or microphone settings.  You should run the 
voice/microphone training session before using it.

"John" <lorenzen_j@hotmail.com> wrote in message 
news:F17496F5-0ACF-453E-988F-AC951068E45F@microsoft.com...
> Given the following code (C# 3.0) any noise even a "cough" will
be 
> recognized as the "Show Search" command what am I doing wrong?
>
>        private void BuildNavigationGrammar()
>        {
>            Choices NavChoices = new Choices("Search");
>
>            GrammarBuilder choicesBuilder = new
GrammarBuilder("Show");
>            choicesBuilder.Append(new
SemanticResultKey("choixNav", 
> NavChoices));
>
>            Grammar NavGrammar = new Grammar(choicesBuilder);
>
>            cvRecognition.LoadGrammar(NavGrammar);
>
>            NavGrammar.SpeechRecognized += delegate(object sender, 
> SpeechRecognizedEventArgs e)
>            {
>                SemanticValue SeVa = e.Result.Semantics;
>                if (SeVa.ContainsKey("choixNav"))
>                {
>                    Application app = System.Windows.Application.Current;
>                    if (app != null)
>                    {
> 
> app.Dispatcher.BeginInvoke(DispatcherPriority.Background, new 
> SimpleDelegate(cvAIM.ShowSearch));
>                    }
>                }
>            };
>        }
>