c# - Abnormal speech result -

i trying use ms tts technology in c#. using ms visual studio 2010 professional, , in windows 7 ultimate 32 bit.

following code

speechsynthesizer s = new speechsynthesizer(); s.selectvoicebyhints(voicegender.male); s.speak("what happening right now?"); 

when run code, thing can hear "bla bla bla". resulting "bla bla bla" sound, no words. if remove second line, can hear speak in default female voice. wrong here?