C# 调用系统声音 嘀~

    public class BeepUp
    {
        /// <param name="iFrequency">声音频率（从37Hz到32767Hz）。在windows95中忽略</param>  
        /// <param name="iDuration">声音的持续时间，以毫秒为单位。</param>  
        [DllImport("Kernel32.dll")] //引入命名空间 using System.Runtime.InteropServices;  
        public static extern bool Beep(int frequency, int duration);
    }