startRecording() called on an uninitialized AudioRecord.

This is the code I have :

micphone = new Mic();
        micphone.StartRecording();
        ...
        public Mic () : base (AudioSource.Mic,11025,ChannelIn.Stereo,Encoding.Pcm16bit,100000)
        {
        returnSize = 0;
        audioData = new byte[32768];
        Frequency = 0;
        Note1 = "0";
        }
        int returnSize;
        byte[] audioData;
        bool flag;
        bool flag2;
        bool temp1;
        double temp9;
        double temp3;
        public double Frequency { get; set; }
        public string Note1 { get; set; }

so it should be working so why is it not initialized?