C# Beep

public class myBeep
    {
        [DllImport("kernal32.dll")]
        public static extern bool Beep(int freq, int duration);

        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);

        public void BeepShow()
        {
            for (int i = 0; i < 10; i++)
            {
                System.Threading.Thread.Sleep(500);
                Console.Beep(4000, 800);// Beep(800,300);
            }
        }

        public void MessageBeepShow()
        {
            for (int i = 0; i < 10; i++)
            {
                System.Threading.Thread.Sleep(500);
                MessageBeep(MessageBeepType.Question);
            }
        }


    }

备注：console.Beep(4000, 800)其中4000是指发声的频率，800是发声时间！