play random wav file using voice recognition

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C#

i have all speech items needed as the project will run with voice commands and respond the way it should. this is a small piece of the code. when i had this assigned to a button on the form it would play one ramdom wav, they are only about 10 seconds long at the most. i want to move to when i say one of the key words it will respond the same as when you push the button. i think i need one line of code but can't figure it out.


I'm working on a speech req program and I'm trying to get it to play a random .wav file when i say a key word. this is what i have so far and it does work if you push a button on the form but i want it to play when it hears one of the words spoken. but can't get the last peace, any help would be great. still learning:

case "for":
case "help":
case"now":
    string[] files = Directory.GetFiles(@"C:\Users\chuck\voice");
    Random rnd = new Random(Guid.NewGuid().GetHashCode());
    int choice = rnd.Next(0, files.Length - 1);
    string soundFile = files[choice];
    System.Media.SoundPlayer player = new System.Media.SoundPlayer(soundFile);
    player.Play();

I'm doing this in C#