Generating a graph while recording audio

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C#3.0

VS2008

C#

Visual-Studio

WPF

I am creating an application which generates a graph while recording audio. When searched for code, I got some help like this in msdn. The problem is that, how do I define the track size when I am recording audio as I am unaware till what time the recording will take place?
Can anybody help in generating the graph as recording is simultaneously going on??
Thanks.

// interval along x-axis

double intervalX = pathX.Width / track[0].mSamples.Length;

 

// looping throught the samples and plotting the curve

for (int i = 0; i < track[0].mTrackSize; i++)

{

    Line line = new Line();

    line.X1 = line.X2 = pathX.Data.Bounds.Location.X + ((i) * intervalX);

    line.Y1 = pathX.Data.Bounds.Location.X + (pathY.Data.Bounds.Location.X) + (pathY.Height / 2);

    line.Y2 = line.Y1 + 5;

     

    polyTrack.Points.Add(new Point(line.X1, line.Y1 - track[0].mSamplesIdea * Math.Pow(10, 2)));

}

 

    track[0].mSamples ---- array containing the sample points of an audio

    pathX ------------------------ my X-axis

    pathY ----------------------- my Y-axis

    polyTrack ------------------ a polyline contained in the canvas to which i'm binding the points and drawing the curve