ObsoleteAttribute.cs

using System.Runtime.InteropServices;

namespace System
{
    [Serializable]
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Event | AttributeTargets.Interface | AttributeTargets.Delegate, Inherited = false)]
    [ComVisible(true)]
    [__DynamicallyInvokable]
    public sealed class ObsoleteAttribute : Attribute
    {
        private string _message;

        private bool _error;

        [__DynamicallyInvokable]
        public string Message
        {
            [__DynamicallyInvokable]
            get
            {
                return _message;
            }
        }

        [__DynamicallyInvokable]
        public bool IsError
        {
            [__DynamicallyInvokable]
            get
            {
                return _error;
            }
        }

        [__DynamicallyInvokable]
        public ObsoleteAttribute()
        {
            _message = null;
            _error = false;
        }

        [__DynamicallyInvokable]
        public ObsoleteAttribute(string message)
        {
            _message = message;
            _error = false;
        }

        [__DynamicallyInvokable]
        public ObsoleteAttribute(string message, bool error)
        {
            _message = message;
            _error = error;
        }
    }
}