[DllImport("coredll.dll", EntryPoint = "MessageBeep")]
        public static extern bool MessageBeep(int iType);

            int i = 0x00000040;
            ClassPublicFunction.MessageBeep(i);

声音的类型

public enum BeepType

{

　 SimpleBeep = -1,

　 IconAsterisk = 0x00000040,

　 IconExclamation = 0x00000030,

　 IconHand = 0x00000010,

　 IconQuestion = 0x00000020,

　 Ok = 0x00000000,

}