C# 播放和暂停播放wav文件

[DllImport("winmm.DLL",
            EntryPoint = "PlaySound",
            SetLastError = true,
            CharSet = CharSet.Unicode,
            ThrowOnUnmappableChar = true)]
        private static extern bool PlaySound(string szSound, System.IntPtr hMod,
            PlaySoundFlags flags);
        [System.Flags]
        public enum PlaySoundFlags : int
        {
            SND_SYNC = 0x0000, //同步播放声音，在播放完后PlaySound函数才返回
            SND_ASYNC = 0x0001, //用异步方式播放声音，PlaySound函数在开始播放后立即返回
            SND_NODEFAULT = 0x0002, //不播放缺省声音，若无此标志，则PlaySound在没找到声音时会播放缺省声音
            SND_LOOP = 0x0008, //重复播放声音，必须与SND_ASYNC标志一块使用
            SND_NOSTOP = 0x0010, //PlaySound不打断原来的声音播出并立即返回FALSE
            SND_NOWAIT = 0x00002000, //如果驱动程序正忙则函数就不播放声音并立即返回
            SND_FILENAME = 0x00020000, //pszSound参数指定了WAVE文件名
            SND_RESOURCE = 0x00040004 //pszSound参数是WAVE资源的标识符，这时要用到hmod参数
        }
public void runSound()
        {


            PlaySound(@"E:\报警声音\ALARM1.WAV", IntPtr.Zero,
                SND_ASYNC | SND_FileNAME | SND_LOOP);
        }

private void button1_Click(object sender, EventArgs e)
        {
            PlaySound(null, IntPtr.Zero, SND_ASYNC);
        }

        private void button2_Click(object sender, EventArgs e)
        {
            new Thread(new ThreadStart(runSound)).Start();
        }