Getting the pitch/frequency of microphone audio in C#

Essentially, I'm trying to write a piece of software that can display the pitch of any incoming audio. I have a C# console app, and I'm using NAudio as a way to take in audio. Here's the code I have to do that:

int SampleRate = 44100;
int BufferMS = 1000;

NAudio.Wave.WaveInEvent Wave = new()
{
    DeviceNumber = 0,
    WaveFormat = new NAudio.Wave.WaveFormat(SampleRate, 1),
    BufferMilliseconds = BufferMS
};

Wave.DataAvailable += OnWaveInData;
Wave.StartRecording();

void OnWaveInData(object? sender, NAudio.Wave.WaveInEventArgs e)
{
    // get the frequency of the audio
    var freq = GetFrequency(e.Buffer, e.BytesRecorded);
    // print freq in hz
    Console.WriteLine($"\r{freq} Hz");
}

I used GitHub Copilot to help me write this next part, as I know I need to use some math to get a frequency out of this, but it seemed quite advanced.

double GetFrequency(byte[] buffer, int bytesRecorded)
{
    double max = 0;
    int maxN = 0;

    for (int i = 0; i < bytesRecorded / 2; i++)
    {
        var real = buffer[2 * i];
        var imag = buffer[2 * i + 1];
        var magnitude = Math.Sqrt(real * real + imag * imag);
        if (magnitude > max)
        {
            max = magnitude;
            maxN = i;
        }
    }

    double freqN = maxN;
    if (maxN > 0 && maxN < bytesRecorded / 2 - 1)
    {
        var dL = buffer[2 * (maxN - 1)];
        var dR = buffer[2 * (maxN + 1)];
        freqN += 0.5 * (dR * dR - dL * dL) / (dR + dL - 2 * buffer[2 * maxN]);
    }

    return freqN * SampleRate / bytesRecorded;
}

It works somewhat okay, but the issue is the frequency reported can be quite sporadic and jump around which is not desireable. Should I just write a filter function to remove these "outliers", or am I approaching this completely incorrectly?

Thanks for any help!