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原文:Beep Sound in C#\.NET Framework

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目前的.NET framework1.0/1.1不支持Beep()，因此我们只能通过以下几种方法达到目标:
(a) 调用Win32 API:
    [DllImport("kernal32.dll")]
    public static extern bool Beep(int freq, int duration);
(b) MessageBeepType
    public enum MessageBeepType
    {
        Default = -1,
        Ok = 0x00000000,
        Error = 0x00000010,
        Question = 0x00000020,
        Warning = 0x00000030,
        Information = 0x00000040,
    } 
    [DllImport("user32.dll", SetLastError=true)]
    public static extern bool MessageBeep(MessageBeepType type);
(c)     使用VB assembly中的Beep()
添加一个到Microsoft.VisualBasic.dll的引用，然后调用:
    Microsoft.VisualBasic.Interaction.Beep()

在Whidbey (.NET Framework V2.0)将在Framework中直接支持Beep():
        Console.Beep();
        Console.Beep(int frequency, in duration);