Micro phone voice recordiing

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C#

hi all
i am trying to develop a window application to record micro phone voice activity.

i am using code below :

[DllImport("winmm.dll", EntryPoint = "mciSendStringA", CharSet = CharSet.Ansi, SetLastError = true, ExactSpelling = true)]
       private static extern int mciSendString(string lpstrCommand, string lpstrReturnString, int uReturnLength, int hwndCallback);

// record from microphone
            mciSendString("open new Type waveaudio Alias recsound", "", 0, 0);
            mciSendString("record recsound", "", 0, 0);

// stop and save
            mciSendString("save recsound c:\\record.wav", "", 0, 0);
            mciSendString("close recsound ", "", 0, 0);
            Computer c = new Computer();
            c.Audio.Stop();

that code save a record.wav file but that file not record conversation on micro phone

please provide me a right solution for that problam

thanx and regards
Sanjay Solanki