SystemSounds.cs

using System.Security.Permissions;

namespace System.Media
{
    [HostProtection(SecurityAction.LinkDemand, UI = true)]
    public sealed class SystemSounds
    {
        private class NativeMethods
        {
            internal const int MB_ICONHAND = 16;

            internal const int MB_ICONQUESTION = 32;

            internal const int MB_ICONEXCLAMATION = 48;

            internal const int MB_ICONASTERISK = 64;

            private NativeMethods()
            {
            }
        }

        private static volatile SystemSound asterisk;

        private static volatile SystemSound beep;

        private static volatile SystemSound exclamation;

        private static volatile SystemSound hand;

        private static volatile SystemSound question;

        public static SystemSound Asterisk
        {
            get
            {
                if (asterisk == null)
                {
                    asterisk = new SystemSound(64);
                }
                return asterisk;
            }
        }

        public static SystemSound Beep
        {
            get
            {
                if (beep == null)
                {
                    beep = new SystemSound(0);
                }
                return beep;
            }
        }

        public static SystemSound Exclamation
        {
            get
            {
                if (exclamation == null)
                {
                    exclamation = new SystemSound(48);
                }
                return exclamation;
            }
        }

        public static SystemSound Hand
        {
            get
            {
                if (hand == null)
                {
                    hand = new SystemSound(16);
                }
                return hand;
            }
        }

        public static SystemSound Question
        {
            get
            {
                if (question == null)
                {
                    question = new SystemSound(32);
                }
                return question;
            }
        }

        private SystemSounds()
        {
        }
    }
}