c# - speech recogination exception "Cannot find the requested data item, such as a data key or value -

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i trying work speech recognition in c#. trying code , gve me exception that

cannot find requested data item, such data key or value

here code using 

 public partial class form1 : form     {         speechrecognizer rec = new speechrecognizer();         public form1()         {             initializecomponent();              rec.speechrecognized += rec_speechrecognized;           }          private void form1_load(object sender, eventargs e)         {             messagebox.show(speechrecognitionengine.installedrecognizers().count.tostring());              var c = new choices();               // doens't work must use english words add choices ,              // populate grammar.              //              //for (var = 0; <= 100; i++)              //  c.add(i.tostring());               c.add("one");              c.add("two");              c.add("three");              c.add("four");              c.add("hi");              c.add("hello");              c.add("i");              c.add("a");              c.add("b");              c.add("c");              c.add("d");              c.add("amer");              // etc...               var gb = new grammarbuilder(c);              var g = new grammar(gb);              rec.loadgrammar(g);              rec.enabled = true;         }         void rec_speechrecognized(object sender, speechrecognizedeventargs e)          {              label1.text = e.result.text;          }     }

please tell me why exception coming


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