[System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);

        [System.Flags]
        public enum PlaySoundFlags : int
        {
            SND_SYNC = 0x0000,
            SND_ASYNC = 0x0001,
            SND_NODEFAULT = 0x0002,
            SND_LOOP = 0x0008,
            SND_NOSTOP = 0x0010,
            SND_NOWAIT = 0x00002000,
            SND_FILENAME = 0x00020000,
            SND_RESOURCE = 0x00040004
        }

 

      private void button1_Click(object sender, EventArgs e)
        {

                //音效
                OpenFileDialog dialog1 = new OpenFileDialog();

                dialog1.Title = "Browse to find sound file to play";
                dialog1.InitialDirectory = @"c:\";
                dialog1.Filter = "Wav Files (*.wav)|*.wav";
                dialog1.FilterIndex = 2;
                dialog1.RestoreDirectory = true;

                if (dialog1.ShowDialog() == DialogResult.OK)
                {
                    //textBox1.Text = dialog1.FileName;/web中也可以調用，改变路径而已
                    PlaySound(dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);
                }

    }