C#讓電腦發聲，播放聲音

//1.
[DllImport("Kernel32.dll")] //引入命名空間 using System.Runtime.InteropServices;  
        public static extern bool Beep(int frequency, int duration);// 第一個參數是指頻率的高低，越大越高，第二個參數是指響的時間多

Beep(500, 700);

//2.
 [DllImport("winmm.dll")]
public static extern bool PlaySound(String Filename, int Mod, int Flags);

PlaySound(@"C:\Windows\media\Windows Proximity Notification.wav", 0, 1);