Obtain samples of the audio file Wave

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C#

How can I get samples through audio files and in using library NAudio so and put it in a matrix and whether we get the samples so as to be of type double, and how?

NAudio.Wave.WaveChannel32 wave =  new NAudio.Wave.WaveChannel32(new NAudio.Wave.WaveFileReader(openFileDialog1.FileName));

Int32 x = Convert.ToInt32(wave.Length);
byte[] buffer = new byte[wave.Length];
float[] data = new float[wave.Length / 4];
int read = wave.Read(buffer, 0, x);

for (int i = 0; i < read / 4; i++)
{
    data[i] = BitConverter.ToSingle(buffer, i * 4)
}

This program that returns the value multiplied by 4 means the repeat samples so that if I have a 1000 sample due 4000 and that the entry be Mono means one channel, what do you advise.

i want to get the sample if it mono i will take mono or stereo i will take stereo .the problem of this program return the sample 32 bit as it mono or stereo what is the result u think ??

Thanks