I am having trouble getting the sound to work in my asteroids game?

Question

So I have been coding a remake of the 1979 Atari game Asteroids, in C# Visual Studio 2019 Windows Forms app. The issue I am having is the sounds are not working correctly:

Here is where I implement the sound, for when a meteor hits the ship:

private void DetectShipToMeteorCollisions()
{
    if (!_ship.IsActive)
        return;

    for (int meteorIndex = 0; meteorIndex < _meteors.Count; meteorIndex++)
    {
        if (_meteors[meteorIndex].CollidesWithShip(_ship))
        {
            _meteors[meteorIndex].IsActive = false;
            GameManager.RaiseMeteorHit(_meteors[meteorIndex]);
            BlowUpShip();
        }
        SoundPlayer1 sound = new SoundPlayer1("bang_6.wav");
        sound.Play(); 
    }
}

// The "bang_6.wav" is imported into the Visual Studio project.

And here is the code for SoundPlayer1

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.IO;
using System.Reflection;

namespace AsteroidsGdiApp.Core
{
    public class SoundPlayer1
    {
        private byte[] m_soundBytes;
        private string m_fileName;

        private enum Flags
        {
            SND_SYNC = 0x0000,  /* play synchronously (default) */
            SND_ASYNC = 0x0001,  /* play asynchronously */
            SND_NODEFAULT = 0x0002,  /* silence (!default) if sound not found */
            SND_MEMORY = 0x0004,  /* pszSound points to a memory file */
            SND_LOOP = 0x0008,  /* loop the sound until next sndPlaySound */
            SND_NOSTOP = 0x0010,  /* don't stop any currently playing sound */
            SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
            SND_ALIAS = 0x00010000, /* name is a registry alias */
            SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
            SND_FILENAME = 0x00020000, /* name is file name */
            SND_RESOURCE = 0x00040004  /* name is resource name or atom */
        }

        [DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private extern static int WCE_PlaySound(string szSound, IntPtr hMod, int flags);

        [DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private extern static int WCE_PlaySoundBytes(byte[] szSound, IntPtr hMod, int flags);

        /// <summary>
        /// Construct the Sound object to play sound data from the specified file.
        /// </summary>
        public SoundPlayer1(string fileName)
        {
            m_fileName = fileName;
        }

        /// <summary>
        /// Construct the Sound object to play sound data from the specified stream.
        /// </summary>
        public SoundPlayer1(Stream stream)
        {
            // read the data from the stream
            m_soundBytes = new byte[stream.Length];
            stream.Read(m_soundBytes, 0, (int)stream.Length);
        }

        /// <summary>
        /// Play the sound
        /// </summary>
        public void Play()
        {
            // if a file name has been registered, call WCE_PlaySound,
            //  otherwise call WCE_PlaySoundBytes
            if (m_fileName != null)
                WCE_PlaySound(m_fileName, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_FILENAME));
            else
                WCE_PlaySoundBytes(m_soundBytes, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_MEMORY));
        }

        public static void PlayEmbeddedSound(Assembly assembly, string resourceName)
        {
            SoundPlayer1 sound = new SoundPlayer1(assembly.GetManifestResourceStream(resourceName));
            sound.Play();
        }

        public static void PlayFromFile(string filePath)
        {
            SoundPlayer1 sound = new SoundPlayer1(filePath);
            sound.Play();
        }
    }
}

Trying to compile once the sound is inserted produces this error:

I wonder why this might be? Thanks very much.

So upon fixing the error, I am attempting to add a sound effect for when a bullet is fired. But for some reason it is not detecting this wav file when it has been imported into the project the same way.

I wonder why it is not finding this wav file.

Here is is, imported to the project. Thanks.

private void DetectBulletCollisions()
{

    for(int meteorIndex = 0; meteorIndex < _meteors.Count; meteorIndex++)
    {
        for (int bulletIndex = 0; bulletIndex < _photons.Length; bulletIndex++)
            
        {
            //TODO get rid of event drive desing here
            _meteors[meteorIndex].TestIfShot(_photons[bulletIndex]);
            System.IO.Stream str = Properties.Resources.mySoundFile;
            System.Media.SoundPlayer snd = new System.Media.SoundPlayer("gunshot.wav");
            snd.Play();
        }
    }
}

Exception of gunshot.wav

Here the file is in same directory. So fact that Visual Studio is not seeing it is bizarre. It's imported in the visual studio project as well, thanks.