路径不是合法形式的错误c#

我正试图通过Form1_Load上的AudioHandler（）设置MenuTrack路径，但它没有将路径添加到Menutrack。mts mts mts-mts-

namespace NGTurnBased
{
class MyVariables
{
    public static string Menu_Track;
    public static SoundPlayer AudioPlayer = new SoundPlayer(Menu_Track);
    public static int Essence = 0;

}
}

---

 private void Form1_Load(object sender, EventArgs e)
    {
        rdb_Ryu.Click += Character_Selected;
        rdb_momiji.Click += Character_Selected;
        getForm();
        AudioHandler();

    }
   private void AudioHandler()
    {
        if (currentForm != "test")
        {
            MyVariables.Menu_Track = @"C:'Users'Gary'Desktop'NGRPG'Volf_BGM.wav";
        }
        MyVariables.AudioPlayer.Play();
    }

public static string Menu_Track;
public static SoundPlayer MenuSelection = new SoundPlayer(Menu_Track);